55981948840 has 64 divisors (see below), whose sum is σ = 133355548800. Its totient is φ = 21091537152.

The previous prime is 55981948831. The next prime is 55981948843. The reversal of 55981948840 is 4884918955.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55981948843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81412 + ... + 344371.

It is an arithmetic number, because the mean of its divisors is an integer number (2083680450).

Almost surely, 2^55981948840 is an apocalyptic number.

It is an amenable number.

55981948840 is an abundant number, since it is smaller than the sum of its proper divisors (77373599960).

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

55981948840 is a wasteful number, since it uses less digits than its factorization.

55981948840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425986 (or 425982 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 61.

The spelling of 55981948840 in words is "fifty-five billion, nine hundred eighty-one million, nine hundred forty-eight thousand, eight hundred forty".