615727668681 has 12 divisors (see below), whose sum is σ = 889392656880. Its totient is φ = 410481306360.

The previous prime is 615727668667. The next prime is 615727668683. The reversal of 615727668681 is 186866727516.

615727668681 is a `hidden beast` number, since 615 + 7 + 2 + 7 + 6 + 6 + 8 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 615727668681 - 2¹⁸ = 615727406537 is a prime.

It is a super-2 number, since 2×615727668681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (615727668683) 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, 991650 + ... + 1488228.

It is an arithmetic number, because the mean of its divisors is an integer number (74116054740).

Almost surely, 2^615727668681 is an apocalyptic number.

It is an amenable number.

615727668681 is a deficient number, since it is larger than the sum of its proper divisors (273664988199).

615727668681 is a wasteful number, since it uses less digits than its factorization.

615727668681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634356 (or 634353 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 615727668681 in words is "six hundred fifteen billion, seven hundred twenty-seven million, six hundred sixty-eight thousand, six hundred eighty-one".