685676787538 has 8 divisors (see below), whose sum is σ = 1042604430588. Its totient is φ = 338141977344.

The previous prime is 685676787533. The next prime is 685676787539. The reversal of 685676787538 is 835787676586.

It can be written as a sum of positive squares in 2 ways, for example, as 633420199129 + 52256588409 = 795877^2 + 228597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (685676787533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2348208031 + ... + 2348208322.

Almost surely, 2^685676787538 is an apocalyptic number.

685676787538 is a deficient number, since it is larger than the sum of its proper divisors (356927643050).

685676787538 is a wasteful number, since it uses less digits than its factorization.

685676787538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696416428.

The product of its digits is 2844979200, while the sum is 76.

The spelling of 685676787538 in words is "six hundred eighty-five billion, six hundred seventy-six million, seven hundred eighty-seven thousand, five hundred thirty-eight".