685077357636 has 135 divisors (see below), whose sum is σ = 2083641062349. Its totient is φ = 195706590912.

The previous prime is 685077357619. The next prime is 685077357659. The reversal of 685077357636 is 636753770586.

The square root of 685077357636 is 827694.

It is a perfect power (a square), and thus also a powerful number.

685077357636 is a `hidden beast` number, since 6 + 8 + 50 + 7 + 7 + 3 + 576 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 616391431236 + 68685926400 = 785106^2 + 262080^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 104286160 + ... + 104292728.

Almost surely, 2^685077357636 is an apocalyptic number.

685077357636 is the 827694-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685077357636

685077357636 is an abundant number, since it is smaller than the sum of its proper divisors (1398563704713).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685077357636 is an frugal number, since it uses more digits than its factorization.

685077357636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13168 (or 6581 counting only the distinct ones).

The product of its (nonzero) digits is 133358400, while the sum is 63.

The spelling of 685077357636 in words is "six hundred eighty-five billion, seventy-seven million, three hundred fifty-seven thousand, six hundred thirty-six".