56491991982 has 48 divisors (see below), whose sum is σ = 126381310848. Its totient is φ = 18218373120.

The previous prime is 56491991957. The next prime is 56491992017. The reversal of 56491991982 is 28919919465.

56491991982 is a `hidden beast` number, since 56 + 491 + 9 + 9 + 1 + 98 + 2 = 666.

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, 2507038 + ... + 2529470.

It is an arithmetic number, because the mean of its divisors is an integer number (2632943976).

Almost surely, 2^56491991982 is an apocalyptic number.

56491991982 is an abundant number, since it is smaller than the sum of its proper divisors (69889318866).

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

56491991982 is a wasteful number, since it uses less digits than its factorization.

56491991982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26985 (or 26982 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 63.

The spelling of 56491991982 in words is "fifty-six billion, four hundred ninety-one million, nine hundred ninety-one thousand, nine hundred eighty-two".