15791987925 has 36 divisors (see below), whose sum is σ = 32325951840. Its totient is φ = 7219193760.

The previous prime is 15791987909. The next prime is 15791987929. The reversal of 15791987925 is 52978919751.

It is not a de Polignac number, because 15791987925 - 2⁴ = 15791987909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15791987929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5011755 + ... + 5014904.

Almost surely, 2^15791987925 is an apocalyptic number.

15791987925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15791987925 is an abundant number, since it is smaller than the sum of its proper divisors (16533963915).

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

15791987925 is a wasteful number, since it uses less digits than its factorization.

15791987925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10026682 (or 10026674 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 63.

The spelling of 15791987925 in words is "fifteen billion, seven hundred ninety-one million, nine hundred eighty-seven thousand, nine hundred twenty-five".