391382497656 has 96 divisors (see below), whose sum is σ = 1115989290000. Its totient is φ = 123571671552.

The previous prime is 391382497643. The next prime is 391382497703. The reversal of 391382497656 is 656794283193.

391382497656 is a `hidden beast` number, since 3 + 9 + 1 + 3 + 82 + 497 + 65 + 6 = 666.

391382497656 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 391382497593 and 391382497602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8366620 + ... + 8413268.

Almost surely, 2^391382497656 is an apocalyptic number.

391382497656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

391382497656 is an abundant number, since it is smaller than the sum of its proper divisors (724606792344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391382497656 is a wasteful number, since it uses less digits than its factorization.

391382497656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52813 (or 52806 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 391382497656 in words is "three hundred ninety-one billion, three hundred eighty-two million, four hundred ninety-seven thousand, six hundred fifty-six".