625668919 has 2 divisors, whose sum is σ = 625668920. Its totient is φ = 625668918.

The previous prime is 625668907. The next prime is 625668947. The reversal of 625668919 is 919866526.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625668919 is a prime.

It is a super-2 number, since 2×625668919² = 782923192405257122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625668419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312834459 + 312834460.

It is an arithmetic number, because the mean of its divisors is an integer number (312834460).

Almost surely, 2^625668919 is an apocalyptic number.

625668919 is a deficient number, since it is larger than the sum of its proper divisors (1).

625668919 is an equidigital number, since it uses as much as digits as its factorization.

625668919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 625668919 is about 25013.3748022933. The cubic root of 625668919 is about 855.2928873575.

The spelling of 625668919 in words is "six hundred twenty-five million, six hundred sixty-eight thousand, nine hundred nineteen".