55520213531 has 4 divisors (see below), whose sum is σ = 55526794752. Its totient is φ = 55513632312.

The previous prime is 55520213503. The next prime is 55520213549. The reversal of 55520213531 is 13531202555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55520213531 - 2¹⁴ = 55520197147 is a prime.

It is a super-2 number, since 2×55520213531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55520213431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3277940 + ... + 3294833.

It is an arithmetic number, because the mean of its divisors is an integer number (13881698688).

Almost surely, 2^55520213531 is an apocalyptic number.

55520213531 is a deficient number, since it is larger than the sum of its proper divisors (6581221).

55520213531 is an equidigital number, since it uses as much as digits as its factorization.

55520213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6581220.

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 55520213531 in words is "fifty-five billion, five hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".