220518905557 has 4 divisors (see below), whose sum is σ = 222579830016. Its totient is φ = 218457981100.

The previous prime is 220518905549. The next prime is 220518905561. The reversal of 220518905557 is 755509815022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220518905557 - 2³ = 220518905549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220518905557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220518905357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030462069 + ... + 1030462282.

It is an arithmetic number, because the mean of its divisors is an integer number (55644957504).

Almost surely, 2^220518905557 is an apocalyptic number.

It is an amenable number.

220518905557 is a deficient number, since it is larger than the sum of its proper divisors (2060924459).

220518905557 is a wasteful number, since it uses less digits than its factorization.

220518905557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060924458.

The product of its (nonzero) digits is 1260000, while the sum is 49.

The spelling of 220518905557 in words is "two hundred twenty billion, five hundred eighteen million, nine hundred five thousand, five hundred fifty-seven".