55221511938 has 32 divisors (see below), whose sum is σ = 111023332992. Its totient is φ = 18310656000.

The previous prime is 55221511921. The next prime is 55221511963. The reversal of 55221511938 is 83911512255.

It is a self number, because there is not a number n which added to its sum of digits gives 55221511938.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081218 + ... + 1131138.

It is an arithmetic number, because the mean of its divisors is an integer number (3469479156).

Almost surely, 2^55221511938 is an apocalyptic number.

55221511938 is an abundant number, since it is smaller than the sum of its proper divisors (55801821054).

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

55221511938 is a wasteful number, since it uses less digits than its factorization.

55221511938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50890.

The product of its digits is 108000, while the sum is 42.

The spelling of 55221511938 in words is "fifty-five billion, two hundred twenty-one million, five hundred eleven thousand, nine hundred thirty-eight".