5644640561 has 16 divisors (see below), whose sum is σ = 6656833920. Its totient is φ = 4685143680.

The previous prime is 5644640557. The next prime is 5644640563. The reversal of 5644640561 is 1650464465.

It is not a de Polignac number, because 5644640561 - 2² = 5644640557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5644640563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3005 + ... + 106293.

It is an arithmetic number, because the mean of its divisors is an integer number (416052120).

Almost surely, 2^5644640561 is an apocalyptic number.

It is an amenable number.

5644640561 is a deficient number, since it is larger than the sum of its proper divisors (1012193359).

5644640561 is a wasteful number, since it uses less digits than its factorization.

5644640561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103544.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 5644640561 is about 75130.8229756603. The cubic root of 5644640561 is about 1780.5141553260.

The spelling of 5644640561 in words is "five billion, six hundred forty-four million, six hundred forty thousand, five hundred sixty-one".