626641643 has 2 divisors, whose sum is σ = 626641644. Its totient is φ = 626641642.

The previous prime is 626641637. The next prime is 626641649. The reversal of 626641643 is 346146626.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (626641637) and next prime (626641649).

It is a cyclic number.

It is not a de Polignac number, because 626641643 - 2⁴ = 626641627 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 626641597 and 626641606.

It is not a weakly prime, because it can be changed into another prime (626641649) 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, 313320821 + 313320822.

It is an arithmetic number, because the mean of its divisors is an integer number (313320822).

Almost surely, 2^626641643 is an apocalyptic number.

626641643 is a deficient number, since it is larger than the sum of its proper divisors (1).

626641643 is an equidigital number, since it uses as much as digits as its factorization.

626641643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 38.

The square root of 626641643 is about 25032.8113283347. The cubic root of 626641643 is about 855.7358975585.

The spelling of 626641643 in words is "six hundred twenty-six million, six hundred forty-one thousand, six hundred forty-three".