1661046912 has 224 divisors, whose sum is σ = 5672407680. Its totient is φ = 474398208.

The previous prime is 1661046911. The next prime is 1661046941. The reversal of 1661046912 is 2196401661.

It is a tau number, because it is divible by the number of its divisors (224).

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 (1661046911) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 651913 + ... + 654455.

Almost surely, 2^1661046912 is an apocalyptic number.

1661046912 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 1661046912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2836203840).

1661046912 is an abundant number, since it is smaller than the sum of its proper divisors (4011360768).

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

1661046912 is an frugal number, since it uses more digits than its factorization.

1661046912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582 (or 2555 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1661046912 is about 40755.9432721168. The cubic root of 1661046912 is about 1184.2970097345.

The spelling of 1661046912 in words is "one billion, six hundred sixty-one million, forty-six thousand, nine hundred twelve".