216886923687 has 32 divisors (see below), whose sum is σ = 342483185664. Its totient is φ = 119470694400.

The previous prime is 216886923653. The next prime is 216886923689. The reversal of 216886923687 is 786329688612.

It is not a de Polignac number, because 216886923687 - 2⁶ = 216886923623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216886923689) 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, 480864 + ... + 815477.

It is an arithmetic number, because the mean of its divisors is an integer number (10702599552).

Almost surely, 2^216886923687 is an apocalyptic number.

216886923687 is a deficient number, since it is larger than the sum of its proper divisors (125596261977).

216886923687 is a wasteful number, since it uses less digits than its factorization.

216886923687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296639.

The product of its digits is 83607552, while the sum is 66.

The spelling of 216886923687 in words is "two hundred sixteen billion, eight hundred eighty-six million, nine hundred twenty-three thousand, six hundred eighty-seven".