685638915942 has 16 divisors (see below), whose sum is σ = 1371292252992. Its totient is φ = 228543901800.

The previous prime is 685638915937. The next prime is 685638915971. The reversal of 685638915942 is 249519836586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75817 + ... + 1173467.

It is an arithmetic number, because the mean of its divisors is an integer number (85705765812).

Almost surely, 2^685638915942 is an apocalyptic number.

685638915942 is an abundant number, since it is smaller than the sum of its proper divisors (685653337050).

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

685638915942 is a wasteful number, since it uses less digits than its factorization.

685638915942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201763.

The product of its digits is 111974400, while the sum is 66.

The spelling of 685638915942 in words is "six hundred eighty-five billion, six hundred thirty-eight million, nine hundred fifteen thousand, nine hundred forty-two".