216989879615 has 16 divisors (see below), whose sum is σ = 263418480000. Its totient is φ = 171573042432.

The previous prime is 216989879551. The next prime is 216989879629. The reversal of 216989879615 is 516978989612.

It is a cyclic number.

It is not a de Polignac number, because 216989879615 - 2⁶ = 216989879551 is a prime.

It is a congruent 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, 1035761 + ... + 1227509.

It is an arithmetic number, because the mean of its divisors is an integer number (16463655000).

Almost surely, 2^216989879615 is an apocalyptic number.

216989879615 is a deficient number, since it is larger than the sum of its proper divisors (46428600385).

216989879615 is a wasteful number, since it uses less digits than its factorization.

216989879615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194386.

The product of its digits is 117573120, while the sum is 71.

The spelling of 216989879615 in words is "two hundred sixteen billion, nine hundred eighty-nine million, eight hundred seventy-nine thousand, six hundred fifteen".