6725220561 has 8 divisors (see below), whose sum is σ = 9963289760. Its totient is φ = 4483480356.

The previous prime is 6725220547. The next prime is 6725220581. The reversal of 6725220561 is 1650225276.

6725220561 is a `hidden beast` number, since 6 + 72 + 5 + 2 + 20 + 561 = 666.

It is not a de Polignac number, because 6725220561 - 2¹⁷ = 6725089489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6725220521) 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, 124541095 + ... + 124541148.

It is an arithmetic number, because the mean of its divisors is an integer number (1245411220).

Almost surely, 2^6725220561 is an apocalyptic number.

It is an amenable number.

6725220561 is a deficient number, since it is larger than the sum of its proper divisors (3238069199).

6725220561 is a wasteful number, since it uses less digits than its factorization.

6725220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249082252 (or 249082246 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 6725220561 is about 82007.4421074088. The cubic root of 6725220561 is about 1887.5661364543.

The spelling of 6725220561 in words is "six billion, seven hundred twenty-five million, two hundred twenty thousand, five hundred sixty-one".