626790557 has 2 divisors, whose sum is σ = 626790558. Its totient is φ = 626790556.

The previous prime is 626790553. The next prime is 626790559. The reversal of 626790557 is 755097626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626701156 + 89401 = 25034^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 626790557 - 2² = 626790553 is a prime.

Together with 626790559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626790551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313395278 + 313395279.

It is an arithmetic number, because the mean of its divisors is an integer number (313395279).

Almost surely, 2^626790557 is an apocalyptic number.

It is an amenable number.

626790557 is a deficient number, since it is larger than the sum of its proper divisors (1).

626790557 is an equidigital number, since it uses as much as digits as its factorization.

626790557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 793800, while the sum is 47.

The square root of 626790557 is about 25035.7855279198. The cubic root of 626790557 is about 855.8036773728.

The spelling of 626790557 in words is "six hundred twenty-six million, seven hundred ninety thousand, five hundred fifty-seven".