18976991017 has 2 divisors, whose sum is σ = 18976991018. Its totient is φ = 18976991016.

The previous prime is 18976991009. The next prime is 18976991107. The reversal of 18976991017 is 71019967981.

Together with next prime (18976991107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13068147856 + 5908843161 = 114316^2 + 76869^2 .

It is a cyclic number.

It is not a de Polignac number, because 18976991017 - 2³ = 18976991009 is a prime.

It is not a weakly prime, because it can be changed into another prime (18976991617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9488495508 + 9488495509.

It is an arithmetic number, because the mean of its divisors is an integer number (9488495509).

Almost surely, 2^18976991017 is an apocalyptic number.

It is an amenable number.

18976991017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18976991017 is an equidigital number, since it uses as much as digits as its factorization.

18976991017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 58.

The spelling of 18976991017 in words is "eighteen billion, nine hundred seventy-six million, nine hundred ninety-one thousand, seventeen".