8625664561 has 8 divisors (see below), whose sum is σ = 9447990120. Its totient is φ = 7838331648.

The previous prime is 8625664547. The next prime is 8625664571. The reversal of 8625664561 is 1654665268.

It can be written as a sum of positive squares in 4 ways, for example, as 253414561 + 8372250000 = 15919^2 + 91500^2 .

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 8625664561 - 2⁷ = 8625664433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8625664571) 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, 8747646 + ... + 8748631.

It is an arithmetic number, because the mean of its divisors is an integer number (1180998765).

Almost surely, 2^8625664561 is an apocalyptic number.

It is an amenable number.

8625664561 is a deficient number, since it is larger than the sum of its proper divisors (822325559).

8625664561 is a wasteful number, since it uses less digits than its factorization.

8625664561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17496323.

The product of its digits is 2073600, while the sum is 49.

The square root of 8625664561 is about 92874.4559122690. The cubic root of 8625664561 is about 2050.8356348174.

The spelling of 8625664561 in words is "eight billion, six hundred twenty-five million, six hundred sixty-four thousand, five hundred sixty-one".