18660858315091 has 2 divisors, whose sum is σ = 18660858315092. Its totient is φ = 18660858315090.

The previous prime is 18660858315067. The next prime is 18660858315101. The reversal of 18660858315091 is 19051385806681.

It is a strong prime.

It is an emirp because it is prime and its reverse (19051385806681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18660858315091 - 2²⁷ = 18660724097363 is a prime.

It is not a weakly prime, because it can be changed into another prime (18660858315691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330429157545 + 9330429157546.

It is an arithmetic number, because the mean of its divisors is an integer number (9330429157546).

Almost surely, 2^{18660858315091} is an apocalyptic number.

18660858315091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18660858315091 is an equidigital number, since it uses as much as digits as its factorization.

18660858315091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12441600, while the sum is 61.

The spelling of 18660858315091 in words is "eighteen trillion, six hundred sixty billion, eight hundred fifty-eight million, three hundred fifteen thousand, ninety-one".