685497735936 has 432 divisors, whose sum is σ = 2155908378624. Its totient is φ = 208224608256.

The previous prime is 685497735931. The next prime is 685497735941. The reversal of 685497735936 is 639537794586.

685497735936 is a `hidden beast` number, since 6 + 8 + 549 + 7 + 73 + 5 + 9 + 3 + 6 = 666.

685497735936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (685497735931) and next prime (685497735941).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (685497735931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1167798235 + ... + 1167798821.

Almost surely, 2^685497735936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685497735936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077954189312).

685497735936 is an abundant number, since it is smaller than the sum of its proper divisors (1470410642688).

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

685497735936 is a wasteful number, since it uses less digits than its factorization.

685497735936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056 (or 1039 counting only the distinct ones).

The product of its digits is 1028764800, while the sum is 72.

The spelling of 685497735936 in words is "six hundred eighty-five billion, four hundred ninety-seven million, seven hundred thirty-five thousand, nine hundred thirty-six".