685948974692580 has 144 divisors (see below), whose sum is σ = 2131480010984688. Its totient is φ = 178456674816000.

The previous prime is 685948974692563. The next prime is 685948974692593. The reversal of 685948974692580 is 85296479849586.

685948974692580 is a `hidden beast` number, since 6 + 8 + 5 + 9 + 4 + 8 + 97 + 469 + 2 + 58 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 102457799156736 + 583491175535844 = 10122144^2 + 24155562^2 .

It is a Harshad number since it is a multiple of its sum of digits (90).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 983117440 + ... + 983814920.

It is an arithmetic number, because the mean of its divisors is an integer number (14801944520727).

Almost surely, 2^{685948974692580} is an apocalyptic number.

685948974692580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685948974692580 is an abundant number, since it is smaller than the sum of its proper divisors (1445531036292108).

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

685948974692580 is a wasteful number, since it uses less digits than its factorization.

685948974692580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830798 (or 830793 counting only the distinct ones).

The product of its (nonzero) digits is 75246796800, while the sum is 90.

The spelling of 685948974692580 in words is "six hundred eighty-five trillion, nine hundred forty-eight billion, nine hundred seventy-four million, six hundred ninety-two thousand, five hundred eighty".