691215139604 has 96 divisors (see below), whose sum is σ = 1362282727680. Its totient is φ = 304150246400.

The previous prime is 691215139579. The next prime is 691215139631. The reversal of 691215139604 is 406931512196.

It is a happy number.

It is a congruent number.

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, 203956742 + ... + 203960130.

It is an arithmetic number, because the mean of its divisors is an integer number (14190445080).

Almost surely, 2^691215139604 is an apocalyptic number.

It is an amenable number.

691215139604 is a deficient number, since it is larger than the sum of its proper divisors (671067588076).

691215139604 is a wasteful number, since it uses less digits than its factorization.

691215139604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289 (or 4287 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 691215139604 in words is "six hundred ninety-one billion, two hundred fifteen million, one hundred thirty-nine thousand, six hundred four".