1661692032 has 576 divisors, whose sum is σ = 6518191680. Its totient is φ = 395366400.

The previous prime is 1661692031. The next prime is 1661692049. The reversal of 1661692032 is 2302961661.

It is a happy number.

1661692032 is a `hidden beast` number, since 1 + 6 + 616 + 9 + 2 + 0 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×1661692032² = 5522440818424578048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1661692031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12684607 + ... + 12684737.

It is an arithmetic number, because the mean of its divisors is an integer number (11316305).

Almost surely, 2^1661692032 is an apocalyptic number.

1661692032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661692032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3259095840).

1661692032 is an abundant number, since it is smaller than the sum of its proper divisors (4856499648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661692032 is a wasteful number, since it uses less digits than its factorization.

1661692032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1661692032 is about 40763.8569323365. The cubic root of 1661692032 is about 1184.4503095988.

The spelling of 1661692032 in words is "one billion, six hundred sixty-one million, six hundred ninety-two thousand, thirty-two".