15122691872 has 18 divisors (see below), whose sum is σ = 29774169243. Its totient is φ = 7560998112.

The previous prime is 15122691811. The next prime is 15122691971. The reversal of 15122691872 is 27819622151.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 7561345936 + 7561345936 = 86956^2 + 86956^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=86956.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 684779 + ... + 706517.

Almost surely, 2^15122691872 is an apocalyptic number.

It is an amenable number.

15122691872 is a deficient number, since it is larger than the sum of its proper divisors (14651477371).

15122691872 is an frugal number, since it uses more digits than its factorization.

15122691872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43488 (or 21741 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 15122691872 in words is "fifteen billion, one hundred twenty-two million, six hundred ninety-one thousand, eight hundred seventy-two".