161517898319 has 2 divisors, whose sum is σ = 161517898320. Its totient is φ = 161517898318.

The previous prime is 161517898313. The next prime is 161517898343. The reversal of 161517898319 is 913898715161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161517898319 - 2⁸ = 161517898063 is a prime.

It is a super-2 number, since 2×161517898319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161517898313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80758949159 + 80758949160.

It is an arithmetic number, because the mean of its divisors is an integer number (80758949160).

Almost surely, 2^161517898319 is an apocalyptic number.

161517898319 is a deficient number, since it is larger than the sum of its proper divisors (1).

161517898319 is an equidigital number, since it uses as much as digits as its factorization.

161517898319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 59.

The spelling of 161517898319 in words is "one hundred sixty-one billion, five hundred seventeen million, eight hundred ninety-eight thousand, three hundred nineteen".