8625664591 has 2 divisors, whose sum is σ = 8625664592. Its totient is φ = 8625664590.

The previous prime is 8625664589. The next prime is 8625664667. The reversal of 8625664591 is 1954665268.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8625664591 - 2¹ = 8625664589 is a prime.

Together with 8625664589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8625664571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4312832295 + 4312832296.

It is an arithmetic number, because the mean of its divisors is an integer number (4312832296).

Almost surely, 2^8625664591 is an apocalyptic number.

8625664591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8625664591 is an equidigital number, since it uses as much as digits as its factorization.

8625664591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 52.

The square root of 8625664591 is about 92874.4560737774. The cubic root of 8625664591 is about 2050.8356371950.

The spelling of 8625664591 in words is "eight billion, six hundred twenty-five million, six hundred sixty-four thousand, five hundred ninety-one".