625404101591 has 2 divisors, whose sum is σ = 625404101592. Its totient is φ = 625404101590.

The previous prime is 625404101587. The next prime is 625404101611. The reversal of 625404101591 is 195101404526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625404101591 - 2² = 625404101587 is a prime.

It is a super-2 number, since 2×625404101591² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625404101501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312702050795 + 312702050796.

It is an arithmetic number, because the mean of its divisors is an integer number (312702050796).

Almost surely, 2^625404101591 is an apocalyptic number.

625404101591 is a deficient number, since it is larger than the sum of its proper divisors (1).

625404101591 is an equidigital number, since it uses as much as digits as its factorization.

625404101591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 625404101591 in words is "six hundred twenty-five billion, four hundred four million, one hundred one thousand, five hundred ninety-one".