216697131594155 has 32 divisors (see below), whose sum is σ = 263254529779200. Its totient is φ = 171216882783232.

The previous prime is 216697131594149. The next prime is 216697131594191. The reversal of 216697131594155 is 551495131796612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 216697131594155 - 2²⁰ = 216697130545579 is a prime.

It is a super-2 number, since 2×216697131594155² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216697131594091 and 216697131594100.

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, 1509244949 + ... + 1509388521.

It is an arithmetic number, because the mean of its divisors is an integer number (8226704055600).

Almost surely, 2^{216697131594155} is an apocalyptic number.

216697131594155 is a deficient number, since it is larger than the sum of its proper divisors (46557398185045).

216697131594155 is a wasteful number, since it uses less digits than its factorization.

216697131594155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147463.

The product of its digits is 61236000, while the sum is 65.

The spelling of 216697131594155 in words is "two hundred sixteen trillion, six hundred ninety-seven billion, one hundred thirty-one million, five hundred ninety-four thousand, one hundred fifty-five".