15156221072 has 20 divisors (see below), whose sum is σ = 31092542316. Its totient is φ = 7132339200.

The previous prime is 15156221053. The next prime is 15156221117. The reversal of 15156221072 is 27012265151.

It can be written as a sum of positive squares in 2 ways, for example, as 7005020416 + 8151200656 = 83696^2 + 90284^2 .

It is a super-2 number, since 2×15156221072² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27860429 + ... + 27860972.

Almost surely, 2^15156221072 is an apocalyptic number.

It is an amenable number.

15156221072 is an abundant number, since it is smaller than the sum of its proper divisors (15936321244).

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

15156221072 is a wasteful number, since it uses less digits than its factorization.

15156221072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55721426 (or 55721420 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 15156221072 in words is "fifteen billion, one hundred fifty-six million, two hundred twenty-one thousand, seventy-two".