76561860681 has 6 divisors (see below), whose sum is σ = 110589354330. Its totient is φ = 51041240448.

The previous prime is 76561860653. The next prime is 76561860689. The reversal of 76561860681 is 18606816567.

76561860681 is a `hidden beast` number, since 76 + 561 + 8 + 6 + 0 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44776676025 + 31785184656 = 211605^2 + 178284^2 .

It is not a de Polignac number, because 76561860681 - 2¹³ = 76561852489 is a prime.

It is a super-2 number, since 2×76561860681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (76561860689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4253436696 + ... + 4253436713.

It is an arithmetic number, because the mean of its divisors is an integer number (18431559055).

Almost surely, 2^76561860681 is an apocalyptic number.

It is an amenable number.

76561860681 is a deficient number, since it is larger than the sum of its proper divisors (34027493649).

76561860681 is a wasteful number, since it uses less digits than its factorization.

76561860681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506873415 (or 8506873412 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 76561860681 in words is "seventy-six billion, five hundred sixty-one million, eight hundred sixty thousand, six hundred eighty-one".