216694734137 has 12 divisors (see below), whose sum is σ = 252207869220. Its totient is φ = 185639309856.

The previous prime is 216694734059. The next prime is 216694734181. The reversal of 216694734137 is 731437496612.

It can be written as a sum of positive squares in 2 ways, for example, as 65936481961 + 150758252176 = 256781^2 + 388276^2 .

It is not a de Polignac number, because 216694734137 - 2²⁸ = 216426298681 is a prime.

It is a super-2 number, since 2×216694734137² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216694737137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1086062 + ... + 1270007.

It is an arithmetic number, because the mean of its divisors is an integer number (21017322435).

Almost surely, 2^216694734137 is an apocalyptic number.

It is an amenable number.

216694734137 is a deficient number, since it is larger than the sum of its proper divisors (35513135083).

216694734137 is a wasteful number, since it uses less digits than its factorization.

216694734137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357960 (or 2357953 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 53.

The spelling of 216694734137 in words is "two hundred sixteen billion, six hundred ninety-four million, seven hundred thirty-four thousand, one hundred thirty-seven".