5645663261 has 8 divisors (see below), whose sum is σ = 6459976320. Its totient is φ = 4833297648.

The previous prime is 5645663251. The next prime is 5645663279. The reversal of 5645663261 is 1623665465.

5645663261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5645663261 - 2³⁰ = 4571921437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5645663251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480641 + ... + 492246.

It is an arithmetic number, because the mean of its divisors is an integer number (807497040).

Almost surely, 2^5645663261 is an apocalyptic number.

It is an amenable number.

5645663261 is a deficient number, since it is larger than the sum of its proper divisors (814313059).

5645663261 is an equidigital number, since it uses as much as digits as its factorization.

5645663261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973723.

The product of its digits is 777600, while the sum is 44.

The square root of 5645663261 is about 75137.6287954311. The cubic root of 5645663261 is about 1780.6216804403.

The spelling of 5645663261 in words is "five billion, six hundred forty-five million, six hundred sixty-three thousand, two hundred sixty-one".