18976991107 has 2 divisors, whose sum is σ = 18976991108. Its totient is φ = 18976991106.

The previous prime is 18976991017. The next prime is 18976991113. The reversal of 18976991107 is 70119967981.

Together with previous prime (18976991017) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18976991107 - 2¹⁹ = 18976466819 is a prime.

It is not a weakly prime, because it can be changed into another prime (18976991807) 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, 9488495553 + 9488495554.

It is an arithmetic number, because the mean of its divisors is an integer number (9488495554).

Almost surely, 2^18976991107 is an apocalyptic number.

18976991107 is a deficient number, since it is larger than the sum of its proper divisors (1).

18976991107 is an equidigital number, since it uses as much as digits as its factorization.

18976991107 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.

Subtracting from 18976991107 its sum of digits (58), we obtain a square (18976991049 = 137757²).

The spelling of 18976991107 in words is "eighteen billion, nine hundred seventy-six million, nine hundred ninety-one thousand, one hundred seven".