56621445211 has 4 divisors (see below), whose sum is σ = 56629450800. Its totient is φ = 56613439624.

The previous prime is 56621445203. The next prime is 56621445229. The reversal of 56621445211 is 11254412665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11254412665 = 5 ⋅2250882533.

It is a cyclic number.

It is not a de Polignac number, because 56621445211 - 2³ = 56621445203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56621745211) 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, 3992176 + ... + 4006333.

It is an arithmetic number, because the mean of its divisors is an integer number (14157362700).

Almost surely, 2^56621445211 is an apocalyptic number.

56621445211 is a deficient number, since it is larger than the sum of its proper divisors (8005589).

56621445211 is an equidigital number, since it uses as much as digits as its factorization.

56621445211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8005588.

The product of its digits is 57600, while the sum is 37.

Adding to 56621445211 its reverse (11254412665), we get a palindrome (67875857876).

The spelling of 56621445211 in words is "fifty-six billion, six hundred twenty-one million, four hundred forty-five thousand, two hundred eleven".