55220543257 has 16 divisors (see below), whose sum is σ = 62565396480. Its totient is φ = 48283030800.

The previous prime is 55220543243. The next prime is 55220543263. The reversal of 55220543257 is 75234502255.

It is a cyclic number.

It is not a de Polignac number, because 55220543257 - 2⁷ = 55220543129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55220543297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441157 + ... + 552322.

It is an arithmetic number, because the mean of its divisors is an integer number (3910337280).

Almost surely, 2^55220543257 is an apocalyptic number.

It is an amenable number.

55220543257 is a deficient number, since it is larger than the sum of its proper divisors (7344853223).

55220543257 is a wasteful number, since it uses less digits than its factorization.

55220543257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993684.

The product of its (nonzero) digits is 420000, while the sum is 40.

The spelling of 55220543257 in words is "fifty-five billion, two hundred twenty million, five hundred forty-three thousand, two hundred fifty-seven".