56554467221 has 4 divisors (see below), whose sum is σ = 64633676832. Its totient is φ = 48475257612.

The previous prime is 56554467197. The next prime is 56554467223. The reversal of 56554467221 is 12276445565.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12276445565 = 5 ⋅2455289113.

It is a cyclic number.

It is not a de Polignac number, because 56554467221 - 2¹⁸ = 56554205077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56554467223) 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, 4039604795 + ... + 4039604808.

It is an arithmetic number, because the mean of its divisors is an integer number (16158419208).

Almost surely, 2^56554467221 is an apocalyptic number.

It is an amenable number.

56554467221 is a deficient number, since it is larger than the sum of its proper divisors (8079209611).

56554467221 is an equidigital number, since it uses as much as digits as its factorization.

56554467221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079209610.

The product of its digits is 2016000, while the sum is 47.

The spelling of 56554467221 in words is "fifty-six billion, five hundred fifty-four million, four hundred sixty-seven thousand, two hundred twenty-one".