626642083538789 has 2 divisors, whose sum is σ = 626642083538790. Its totient is φ = 626642083538788.

The previous prime is 626642083538741. The next prime is 626642083538833. The reversal of 626642083538789 is 987835380246626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445940148117025 + 180701935421764 = 21117295^2 + 13442542^2 .

It is a cyclic number.

It is not a de Polignac number, because 626642083538789 - 2¹⁶ = 626642083473253 is a prime.

It is a super-2 number, since 2×626642083538789² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626642083538489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313321041769394 + 313321041769395.

It is an arithmetic number, because the mean of its divisors is an integer number (313321041769395).

Almost surely, 2^{626642083538789} is an apocalyptic number.

It is an amenable number.

626642083538789 is a deficient number, since it is larger than the sum of its proper divisors (1).

626642083538789 is an equidigital number, since it uses as much as digits as its factorization.

626642083538789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5016453120, while the sum is 77.

The spelling of 626642083538789 in words is "six hundred twenty-six trillion, six hundred forty-two billion, eighty-three million, five hundred thirty-eight thousand, seven hundred eighty-nine".