685761650685 has 16 divisors (see below), whose sum is σ = 1219131823680. Its totient is φ = 365739546960.

The previous prime is 685761650681. The next prime is 685761650687. The reversal of 685761650685 is 586056167586.

It is a happy number.

685761650685 is a `hidden beast` number, since 6 + 8 + 5 + 7 + 616 + 5 + 0 + 6 + 8 + 5 = 666.

It is not a de Polignac number, because 685761650685 - 2² = 685761650681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685761650681) 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, 2539857831 + ... + 2539858100.

It is an arithmetic number, because the mean of its divisors is an integer number (76195738980).

Almost surely, 2^685761650685 is an apocalyptic number.

It is an amenable number.

685761650685 is a deficient number, since it is larger than the sum of its proper divisors (533370172995).

685761650685 is a wasteful number, since it uses less digits than its factorization.

685761650685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5079715945 (or 5079715939 counting only the distinct ones).

The product of its (nonzero) digits is 72576000, while the sum is 63.

The spelling of 685761650685 in words is "six hundred eighty-five billion, seven hundred sixty-one million, six hundred fifty thousand, six hundred eighty-five".