56451551406321 has 4 divisors (see below), whose sum is σ = 75268735208432. Its totient is φ = 37634367604212.

The previous prime is 56451551406287. The next prime is 56451551406329. The reversal of 56451551406321 is 12360415515465.

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 not a de Polignac number, because 56451551406321 - 2²⁵ = 56451517851889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56451551406329) 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, 9408591901051 + ... + 9408591901056.

It is an arithmetic number, because the mean of its divisors is an integer number (18817183802108).

Almost surely, 2^{56451551406321} is an apocalyptic number.

It is an amenable number.

56451551406321 is a deficient number, since it is larger than the sum of its proper divisors (18817183802111).

56451551406321 is a wasteful number, since it uses less digits than its factorization.

56451551406321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18817183802110.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 56451551406321 in words is "fifty-six trillion, four hundred fifty-one billion, five hundred fifty-one million, four hundred six thousand, three hundred twenty-one".