55918381956 has 12 divisors (see below), whose sum is σ = 130476224592. Its totient is φ = 18639460648.

The previous prime is 55918381913. The next prime is 55918381991. The reversal of 55918381956 is 65918381955.

55918381956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 55918381956.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2329932570 + ... + 2329932593.

It is an arithmetic number, because the mean of its divisors is an integer number (10873018716).

Almost surely, 2^55918381956 is an apocalyptic number.

It is an amenable number.

55918381956 is an abundant number, since it is smaller than the sum of its proper divisors (74557842636).

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

55918381956 is a wasteful number, since it uses less digits than its factorization.

55918381956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659865170 (or 4659865168 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 60.

Subtracting 55918381956 from its reverse (65918381955), we obtain a palindrome (9999999999).

The spelling of 55918381956 in words is "fifty-five billion, nine hundred eighteen million, three hundred eighty-one thousand, nine hundred fifty-six".