5664477321561 has 4 divisors (see below), whose sum is σ = 7552636428752. Its totient is φ = 3776318214372.

The previous prime is 5664477321553. The next prime is 5664477321589. The reversal of 5664477321561 is 1651237744665.

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 5664477321561 - 2³ = 5664477321553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5664477321361) 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, 944079553591 + ... + 944079553596.

It is an arithmetic number, because the mean of its divisors is an integer number (1888159107188).

Almost surely, 2^{5664477321561} is an apocalyptic number.

It is an amenable number.

5664477321561 is a deficient number, since it is larger than the sum of its proper divisors (1888159107191).

5664477321561 is a wasteful number, since it uses less digits than its factorization.

5664477321561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888159107190.

The product of its digits is 25401600, while the sum is 57.

The spelling of 5664477321561 in words is "five trillion, six hundred sixty-four billion, four hundred seventy-seven million, three hundred twenty-one thousand, five hundred sixty-one".