691313194385 has 32 divisors (see below), whose sum is σ = 913224343680. Its totient is φ = 502358197440.

The previous prime is 691313194379. The next prime is 691313194409. The reversal of 691313194385 is 583491313196.

691313194385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-691313194385 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8136734 + ... + 8221256.

It is an arithmetic number, because the mean of its divisors is an integer number (28538260740).

Almost surely, 2^691313194385 is an apocalyptic number.

It is an amenable number.

691313194385 is a deficient number, since it is larger than the sum of its proper divisors (221911149295).

691313194385 is a wasteful number, since it uses less digits than its factorization.

691313194385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85790 (or 85768 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 53.

The spelling of 691313194385 in words is "six hundred ninety-one billion, three hundred thirteen million, one hundred ninety-four thousand, three hundred eighty-five".