15665451252 has 48 divisors (see below), whose sum is σ = 39930788352. Its totient is φ = 4740547680.

The previous prime is 15665451239. The next prime is 15665451253. The reversal of 15665451252 is 25215456651.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15665451253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14343 + ... + 177585.

It is an arithmetic number, because the mean of its divisors is an integer number (831891424).

Almost surely, 2^15665451252 is an apocalyptic number.

15665451252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15665451252 is an abundant number, since it is smaller than the sum of its proper divisors (24265337100).

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

15665451252 is a wasteful number, since it uses less digits than its factorization.

15665451252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163988 (or 163986 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The spelling of 15665451252 in words is "fifteen billion, six hundred sixty-five million, four hundred fifty-one thousand, two hundred fifty-two".