625515643 has 2 divisors, whose sum is σ = 625515644. Its totient is φ = 625515642.

The previous prime is 625515637. The next prime is 625515661. The reversal of 625515643 is 346515526.

625515643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625515643 - 2²¹ = 623418491 is a prime.

It is not a weakly prime, because it can be changed into another prime (625515043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312757821 + 312757822.

It is an arithmetic number, because the mean of its divisors is an integer number (312757822).

Almost surely, 2^625515643 is an apocalyptic number.

625515643 is a deficient number, since it is larger than the sum of its proper divisors (1).

625515643 is an equidigital number, since it uses as much as digits as its factorization.

625515643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 37.

The square root of 625515643 is about 25010.3107337754. The cubic root of 625515643 is about 855.2230386055.

The spelling of 625515643 in words is "six hundred twenty-five million, five hundred fifteen thousand, six hundred forty-three".