215715611172 has 24 divisors (see below), whose sum is σ = 505553773536. Its totient is φ = 71588439808.

The previous prime is 215715611119. The next prime is 215715611197. The reversal of 215715611172 is 271116517512.

It is a self number, because there is not a number n which added to its sum of digits gives 215715611172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39592653 + ... + 39598100.

It is an arithmetic number, because the mean of its divisors is an integer number (21064740564).

Almost surely, 2^215715611172 is an apocalyptic number.

It is an amenable number.

215715611172 is an abundant number, since it is smaller than the sum of its proper divisors (289838162364).

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

215715611172 is a wasteful number, since it uses less digits than its factorization.

215715611172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79190987 (or 79190985 counting only the distinct ones).

The product of its digits is 29400, while the sum is 39.

The spelling of 215715611172 in words is "two hundred fifteen billion, seven hundred fifteen million, six hundred eleven thousand, one hundred seventy-two".