56657421451 has 4 divisors (see below), whose sum is σ = 56658449592. Its totient is φ = 56656393312.

The previous prime is 56657421439. The next prime is 56657421487. The reversal of 56657421451 is 15412475665.

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 56657421451 - 2⁷ = 56657421323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56657421851) 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, 426430 + ... + 543283.

It is an arithmetic number, because the mean of its divisors is an integer number (14164612398).

Almost surely, 2^56657421451 is an apocalyptic number.

56657421451 is a deficient number, since it is larger than the sum of its proper divisors (1028141).

56657421451 is an equidigital number, since it uses as much as digits as its factorization.

56657421451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028140.

The product of its digits is 1008000, while the sum is 46.

The spelling of 56657421451 in words is "fifty-six billion, six hundred fifty-seven million, four hundred twenty-one thousand, four hundred fifty-one".