215817558208231 has 16 divisors (see below), whose sum is σ = 248671392945664. Its totient is φ = 183474072951264.

The previous prime is 215817558208223. The next prime is 215817558208267. The reversal of 215817558208231 is 132802855718512.

215817558208231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 215817558208231 - 2³ = 215817558208223 is a prime.

It is a super-2 number, since 2×215817558208231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215817558208201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193641180 + ... + 194752513.

It is an arithmetic number, because the mean of its divisors is an integer number (15541962059104).

Almost surely, 2^{215817558208231} is an apocalyptic number.

215817558208231 is a deficient number, since it is larger than the sum of its proper divisors (32853834737433).

215817558208231 is a wasteful number, since it uses less digits than its factorization.

215817558208231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388394350.

The product of its (nonzero) digits is 10752000, while the sum is 58.

The spelling of 215817558208231 in words is "two hundred fifteen trillion, eight hundred seventeen billion, five hundred fifty-eight million, two hundred eight thousand, two hundred thirty-one".