55521977472 has 384 divisors, whose sum is σ = 181438595520. Its totient is φ = 16796160000.

The previous prime is 55521977471. The next prime is 55521977473. The reversal of 55521977472 is 27477912555.

55521977472 is a `hidden beast` number, since 5 + 5 + 521 + 9 + 77 + 47 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (55521977471) and next prime (55521977473).

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (55521977471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24664347 + ... + 24666597.

Almost surely, 2^55521977472 is an apocalyptic number.

55521977472 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55521977472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90719297760).

55521977472 is an abundant number, since it is smaller than the sum of its proper divisors (125916618048).

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

55521977472 is a wasteful number, since it uses less digits than its factorization.

55521977472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2330 counting only the distinct ones).

The product of its digits is 6174000, while the sum is 54.

The spelling of 55521977472 in words is "fifty-five billion, five hundred twenty-one million, nine hundred seventy-seven thousand, four hundred seventy-two".