217306579776231 has 48 divisors (see below), whose sum is σ = 337635451940864. Its totient is φ = 124007875992000.

The previous prime is 217306579776199. The next prime is 217306579776259. The reversal of 217306579776231 is 132677975603712.

It is not a de Polignac number, because 217306579776231 - 2⁵ = 217306579776199 is a prime.

It is a super-2 number, since 2×217306579776231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217306579776031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260542975 + ... + 261375696.

Almost surely, 2^{217306579776231} is an apocalyptic number.

217306579776231 is a deficient number, since it is larger than the sum of its proper divisors (120328872164633).

217306579776231 is a wasteful number, since it uses less digits than its factorization.

217306579776231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521918764 (or 521918753 counting only the distinct ones).

The product of its (nonzero) digits is 140026320, while the sum is 66.

The spelling of 217306579776231 in words is "two hundred seventeen trillion, three hundred six billion, five hundred seventy-nine million, seven hundred seventy-six thousand, two hundred thirty-one".