17891320099 has 2 divisors, whose sum is σ = 17891320100. Its totient is φ = 17891320098.

The previous prime is 17891320039. The next prime is 17891320123. The reversal of 17891320099 is 99002319871.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17891320099 - 2³³ = 9301385507 is a prime.

It is not a weakly prime, because it can be changed into another prime (17891320039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8945660049 + 8945660050.

It is an arithmetic number, because the mean of its divisors is an integer number (8945660050).

Almost surely, 2^17891320099 is an apocalyptic number.

17891320099 is a deficient number, since it is larger than the sum of its proper divisors (1).

17891320099 is an equidigital number, since it uses as much as digits as its factorization.

17891320099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 49.

The spelling of 17891320099 in words is "seventeen billion, eight hundred ninety-one million, three hundred twenty thousand, ninety-nine".