685413791604 has 18 divisors (see below), whose sum is σ = 1732573751090. Its totient is φ = 228471263856.

The previous prime is 685413791561. The next prime is 685413791677. The reversal of 685413791604 is 406197314586.

685413791604 is a `hidden beast` number, since 6 + 8 + 541 + 3 + 7 + 91 + 6 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 677905222500 + 7508569104 = 823350^2 + 86652^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9519635959 + ... + 9519636030.

Almost surely, 2^685413791604 is an apocalyptic number.

It is an amenable number.

685413791604 is an abundant number, since it is smaller than the sum of its proper divisors (1047159959486).

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

685413791604 is a wasteful number, since it uses less digits than its factorization.

685413791604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19039271999 (or 19039271994 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 685413791604 in words is "six hundred eighty-five billion, four hundred thirteen million, seven hundred ninety-one thousand, six hundred four".