686214779538 has 32 divisors (see below), whose sum is σ = 1393053837120. Its totient is φ = 225323873600.

The previous prime is 686214779521. The next prime is 686214779543. The reversal of 686214779538 is 835977412686.

686214779538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2754648 + ... + 2993411.

It is an arithmetic number, because the mean of its divisors is an integer number (43532932410).

Almost surely, 2^686214779538 is an apocalyptic number.

686214779538 is an abundant number, since it is smaller than the sum of its proper divisors (706839057582).

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

686214779538 is a wasteful number, since it uses less digits than its factorization.

686214779538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5748362.

The product of its digits is 121927680, while the sum is 66.

The spelling of 686214779538 in words is "six hundred eighty-six billion, two hundred fourteen million, seven hundred seventy-nine thousand, five hundred thirty-eight".