625504305991 has 2 divisors, whose sum is σ = 625504305992. Its totient is φ = 625504305990.

The previous prime is 625504305989. The next prime is 625504306003. The reversal of 625504305991 is 199503405526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625504305991 - 2¹ = 625504305989 is a prime.

Together with 625504305989, 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 (625504305911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312752152995 + 312752152996.

It is an arithmetic number, because the mean of its divisors is an integer number (312752152996).

Almost surely, 2^625504305991 is an apocalyptic number.

625504305991 is a deficient number, since it is larger than the sum of its proper divisors (1).

625504305991 is an equidigital number, since it uses as much as digits as its factorization.

625504305991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 625504305991 in words is "six hundred twenty-five billion, five hundred four million, three hundred five thousand, nine hundred ninety-one".