6625574686391 has 2 divisors, whose sum is σ = 6625574686392. Its totient is φ = 6625574686390.

The previous prime is 6625574686337. The next prime is 6625574686397. The reversal of 6625574686391 is 1936864755266.

6625574686391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6625574686391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6625574686397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312787343195 + 3312787343196.

It is an arithmetic number, because the mean of its divisors is an integer number (3312787343196).

Almost surely, 2^{6625574686391} is an apocalyptic number.

6625574686391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6625574686391 is an equidigital number, since it uses as much as digits as its factorization.

6625574686391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 391910400, while the sum is 68.

The spelling of 6625574686391 in words is "six trillion, six hundred twenty-five billion, five hundred seventy-four million, six hundred eighty-six thousand, three hundred ninety-one".