691420396925 has 12 divisors (see below), whose sum is σ = 875603023296. Its totient is φ = 541367458800.

The previous prime is 691420396921. The next prime is 691420396943. The reversal of 691420396925 is 529693024196.

It is not a de Polignac number, because 691420396925 - 2² = 691420396921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691420396921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294220271 + ... + 294222620.

It is an arithmetic number, because the mean of its divisors is an integer number (72966918608).

Almost surely, 2^691420396925 is an apocalyptic number.

It is an amenable number.

691420396925 is a deficient number, since it is larger than the sum of its proper divisors (184182626371).

691420396925 is a wasteful number, since it uses less digits than its factorization.

691420396925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588442948 (or 588442943 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 56.

The spelling of 691420396925 in words is "six hundred ninety-one billion, four hundred twenty million, three hundred ninety-six thousand, nine hundred twenty-five".