15857142872 has 32 divisors (see below), whose sum is σ = 29886796800. Its totient is φ = 7887382944.

The previous prime is 15857142871. The next prime is 15857142877. The reversal of 15857142872 is 27824175851.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 15857142872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15857142871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3721079 + ... + 3725337.

It is an arithmetic number, because the mean of its divisors is an integer number (933962400).

Almost surely, 2^15857142872 is an apocalyptic number.

It is an amenable number.

15857142872 is a deficient number, since it is larger than the sum of its proper divisors (14029653928).

15857142872 is a wasteful number, since it uses less digits than its factorization.

15857142872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6575 (or 6571 counting only the distinct ones).

The product of its digits is 1254400, while the sum is 50.

The spelling of 15857142872 in words is "fifteen billion, eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred seventy-two".