55921722504912 has 480 divisors, whose sum is σ = 181452043468800. Its totient is φ = 15909951974400.

The previous prime is 55921722504911. The next prime is 55921722504913. The reversal of 55921722504912 is 21940522712955.

It is a happy number.

55921722504912 is a `hidden beast` number, since 5 + 5 + 9 + 21 + 7 + 22 + 504 + 91 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (55921722504911) and next prime (55921722504913).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55921722504911) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1420791889 + ... + 1420831247.

It is an arithmetic number, because the mean of its divisors is an integer number (378025090560).

Almost surely, 2^{55921722504912} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55921722504912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90726021734400).

55921722504912 is an abundant number, since it is smaller than the sum of its proper divisors (125530320963888).

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

55921722504912 is a wasteful number, since it uses less digits than its factorization.

55921722504912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40127 (or 40118 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 55921722504912 in words is "fifty-five trillion, nine hundred twenty-one billion, seven hundred twenty-two million, five hundred four thousand, nine hundred twelve".