691377822938 has 16 divisors (see below), whose sum is σ = 1131371439840. Its totient is φ = 314255449200.

The previous prime is 691377822901. The next prime is 691377822943. The reversal of 691377822938 is 839228773196.

691377822938 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 7 ways as a sum of consecutive naturals, for example, 690668 + ... + 1363736.

It is an arithmetic number, because the mean of its divisors is an integer number (70710714990).

Almost surely, 2^691377822938 is an apocalyptic number.

691377822938 is a deficient number, since it is larger than the sum of its proper divisors (439993616902).

691377822938 is a wasteful number, since it uses less digits than its factorization.

691377822938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719773.

The product of its digits is 54867456, while the sum is 65.

The spelling of 691377822938 in words is "six hundred ninety-one billion, three hundred seventy-seven million, eight hundred twenty-two thousand, nine hundred thirty-eight".