8625709561 has 24 divisors (see below), whose sum is σ = 10249001280. Its totient is φ = 7235740512.

The previous prime is 8625709549. The next prime is 8625709567. The reversal of 8625709561 is 1659075268.

It is not a de Polignac number, because 8625709561 - 2⁵ = 8625709529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (8625709567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084180 + ... + 1092106.

It is an arithmetic number, because the mean of its divisors is an integer number (427041720).

Almost surely, 2^8625709561 is an apocalyptic number.

It is an amenable number.

8625709561 is a deficient number, since it is larger than the sum of its proper divisors (1623291719).

8625709561 is a wasteful number, since it uses less digits than its factorization.

8625709561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8413 (or 8406 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 8625709561 is about 92874.6981744759. The cubic root of 8625709561 is about 2050.8392012071.

The spelling of 8625709561 in words is "eight billion, six hundred twenty-five million, seven hundred nine thousand, five hundred sixty-one".