215311132465 has 32 divisors (see below), whose sum is σ = 303594480000. Its totient is φ = 144520273920.

The previous prime is 215311132433. The next prime is 215311132471. The reversal of 215311132465 is 564231113512.

It is not a de Polignac number, because 215311132465 - 2⁵ = 215311132433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215311132465.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4910961 + ... + 4954609.

It is an arithmetic number, because the mean of its divisors is an integer number (9487327500).

Almost surely, 2^215311132465 is an apocalyptic number.

It is an amenable number.

215311132465 is a deficient number, since it is larger than the sum of its proper divisors (88283347535).

215311132465 is a wasteful number, since it uses less digits than its factorization.

215311132465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50577.

The product of its digits is 21600, while the sum is 34.

Adding to 215311132465 its reverse (564231113512), we get a palindrome (779542245977).

The spelling of 215311132465 in words is "two hundred fifteen billion, three hundred eleven million, one hundred thirty-two thousand, four hundred sixty-five".