17977356893 has 2 divisors, whose sum is σ = 17977356894. Its totient is φ = 17977356892.

The previous prime is 17977356829. The next prime is 17977356949. The reversal of 17977356893 is 39865377971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14458138564 + 3519218329 = 120242^2 + 59323^2 .

It is an emirp because it is prime and its reverse (39865377971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17977356893 - 2⁶ = 17977356829 is a prime.

It is a super-2 number, since 2×17977356893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17977256893) 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, 8988678446 + 8988678447.

It is an arithmetic number, because the mean of its divisors is an integer number (8988678447).

Almost surely, 2^17977356893 is an apocalyptic number.

It is an amenable number.

17977356893 is a deficient number, since it is larger than the sum of its proper divisors (1).

17977356893 is an equidigital number, since it uses as much as digits as its factorization.

17977356893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60011280, while the sum is 65.

The spelling of 17977356893 in words is "seventeen billion, nine hundred seventy-seven million, three hundred fifty-six thousand, eight hundred ninety-three".