685662538016 has 24 divisors (see below), whose sum is σ = 1350370789740. Its totient is φ = 342711226368.

The previous prime is 685662537961. The next prime is 685662538049. The reversal of 685662538016 is 610835266586.

It can be written as a sum of positive squares in 2 ways, for example, as 617802288016 + 67860250000 = 786004^2 + 260500^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3658481 + ... + 3841328.

Almost surely, 2^685662538016 is an apocalyptic number.

It is an amenable number.

685662538016 is a deficient number, since it is larger than the sum of its proper divisors (664708251724).

685662538016 is a wasteful number, since it uses less digits than its factorization.

685662538016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502676 (or 7502668 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 56.

The spelling of 685662538016 in words is "six hundred eighty-five billion, six hundred sixty-two million, five hundred thirty-eight thousand, sixteen".