790644613021 has 2 divisors, whose sum is σ = 790644613022. Its totient is φ = 790644613020.

The previous prime is 790644613019. The next prime is 790644613069. The reversal of 790644613021 is 120316446097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 789529988025 + 1114624996 = 888555^2 + 33386^2 .

It is an emirp because it is prime and its reverse (120316446097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 790644613021 - 2¹ = 790644613019 is a prime.

Together with 790644613019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (790644613001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395322306510 + 395322306511.

It is an arithmetic number, because the mean of its divisors is an integer number (395322306511).

Almost surely, 2^790644613021 is an apocalyptic number.

It is an amenable number.

790644613021 is a deficient number, since it is larger than the sum of its proper divisors (1).

790644613021 is an equidigital number, since it uses as much as digits as its factorization.

790644613021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 790644613021 in words is "seven hundred ninety billion, six hundred forty-four million, six hundred thirteen thousand, twenty-one".