55223021952 has 384 divisors, whose sum is σ = 196242696000. Its totient is φ = 14848081920.

The previous prime is 55223021951. The next prime is 55223021981. The reversal of 55223021952 is 25912032255.

55223021952 is a `hidden beast` number, since 552 + 2 + 30 + 21 + 9 + 52 = 666.

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

It is a super-2 number, since 2×55223021952² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55223021951) 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, 6713202 + ... + 6721422.

Almost surely, 2^55223021952 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 55223021952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98121348000).

55223021952 is an abundant number, since it is smaller than the sum of its proper divisors (141019674048).

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

55223021952 is a wasteful number, since it uses less digits than its factorization.

55223021952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279 (or 8250 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 55223021952 in words is "fifty-five billion, two hundred twenty-three million, twenty-one thousand, nine hundred fifty-two".