691880255486 has 64 divisors (see below), whose sum is σ = 1282308796800. Its totient is φ = 278897149440.

The previous prime is 691880255477. The next prime is 691880255513. The reversal of 691880255486 is 684552088196.

It is a super-4 number, since 4×691880255486⁴ (a number of 48 digits) contains 4444 as substring.

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, 18792416 + ... + 18829196.

It is an arithmetic number, because the mean of its divisors is an integer number (20036074950).

Almost surely, 2^691880255486 is an apocalyptic number.

691880255486 is a deficient number, since it is larger than the sum of its proper divisors (590428541314).

691880255486 is a wasteful number, since it uses less digits than its factorization.

691880255486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38434 (or 38420 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 62.

The spelling of 691880255486 in words is "six hundred ninety-one billion, eight hundred eighty million, two hundred fifty-five thousand, four hundred eighty-six".