626617643 has 2 divisors, whose sum is σ = 626617644. Its totient is φ = 626617642.

The previous prime is 626617639. The next prime is 626617661. The reversal of 626617643 is 346716626.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 626617643 - 2² = 626617639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 626617643.

It is not a weakly prime, because it can be changed into another prime (626617613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313308821 + 313308822.

It is an arithmetic number, because the mean of its divisors is an integer number (313308822).

Almost surely, 2^626617643 is an apocalyptic number.

626617643 is a deficient number, since it is larger than the sum of its proper divisors (1).

626617643 is an equidigital number, since it uses as much as digits as its factorization.

626617643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 626617643 is about 25032.3319528964. The cubic root of 626617643 is about 855.7249726947.

The spelling of 626617643 in words is "six hundred twenty-six million, six hundred seventeen thousand, six hundred forty-three".