216937976915 has 16 divisors (see below), whose sum is σ = 284904711936. Its totient is φ = 157265752800.

The previous prime is 216937976891. The next prime is 216937976923. The reversal of 216937976915 is 519679739612.

It is not a de Polignac number, because 216937976915 - 2⁶ = 216937976851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6324257 + ... + 6358466.

It is an arithmetic number, because the mean of its divisors is an integer number (17806544496).

Almost surely, 2^216937976915 is an apocalyptic number.

216937976915 is a deficient number, since it is larger than the sum of its proper divisors (67966735021).

216937976915 is a wasteful number, since it uses less digits than its factorization.

216937976915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12683050.

The product of its digits is 38578680, while the sum is 65.

It can be divided in two parts, 21693797 and 6915, that added together give a palindrome (21700712).

The spelling of 216937976915 in words is "two hundred sixteen billion, nine hundred thirty-seven million, nine hundred seventy-six thousand, nine hundred fifteen".