215887097361 has 32 divisors (see below), whose sum is σ = 314719928320. Its totient is φ = 130828509504.

The previous prime is 215887097329. The next prime is 215887097423. The reversal of 215887097361 is 163790788512.

It is a happy number.

It is not a de Polignac number, because 215887097361 - 2⁵ = 215887097329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215887097761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9350850 + ... + 9373908.

It is an arithmetic number, because the mean of its divisors is an integer number (9834997760).

Almost surely, 2^215887097361 is an apocalyptic number.

It is an amenable number.

215887097361 is a deficient number, since it is larger than the sum of its proper divisors (98832830959).

215887097361 is a wasteful number, since it uses less digits than its factorization.

215887097361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26725.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 215887097361 in words is "two hundred fifteen billion, eight hundred eighty-seven million, ninety-seven thousand, three hundred sixty-one".