1661632452 has 36 divisors (see below), whose sum is σ = 4206449520. Its totient is φ = 553058352.

The previous prime is 1661632451. The next prime is 1661632487. The reversal of 1661632452 is 2542361661.

1661632452 is a `hidden beast` number, since 1 + 6 + 616 + 32 + 4 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1661632452² = 5522044811079064608, 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 (1661632451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9202 + ... + 58377.

It is an arithmetic number, because the mean of its divisors is an integer number (116845820).

Almost surely, 2^1661632452 is an apocalyptic number.

1661632452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1661632452 is an abundant number, since it is smaller than the sum of its proper divisors (2544817068).

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

1661632452 is a wasteful number, since it uses less digits than its factorization.

1661632452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68272 (or 68267 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1661632452 is about 40763.1261313457. The cubic root of 1661632452 is about 1184.4361532666.

The spelling of 1661632452 in words is "one billion, six hundred sixty-one million, six hundred thirty-two thousand, four hundred fifty-two".