17790357979 has 2 divisors, whose sum is σ = 17790357980. Its totient is φ = 17790357978.

The previous prime is 17790357971. The next prime is 17790357997. The reversal of 17790357979 is 97975309771.

Together with next prime (17790357997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17790357979 - 2³ = 17790357971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17790357979.

It is not a weakly prime, because it can be changed into another prime (17790357971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8895178989 + 8895178990.

It is an arithmetic number, because the mean of its divisors is an integer number (8895178990).

Almost surely, 2^17790357979 is an apocalyptic number.

17790357979 is a deficient number, since it is larger than the sum of its proper divisors (1).

17790357979 is an equidigital number, since it uses as much as digits as its factorization.

17790357979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26254935, while the sum is 64.

It can be divided in two parts, 17790 and 357979, that added together give a square (375769 = 613²).

The spelling of 17790357979 in words is "seventeen billion, seven hundred ninety million, three hundred fifty-seven thousand, nine hundred seventy-nine".