161901945695179 has 2 divisors, whose sum is σ = 161901945695180. Its totient is φ = 161901945695178.

The previous prime is 161901945695159. The next prime is 161901945695251. The reversal of 161901945695179 is 971596549109161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161901945695179 - 2¹⁹ = 161901945170891 is a prime.

It is not a weakly prime, because it can be changed into another prime (161901945695159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80950972847589 + 80950972847590.

It is an arithmetic number, because the mean of its divisors is an integer number (80950972847590).

Almost surely, 2^{161901945695179} is an apocalyptic number.

161901945695179 is a deficient number, since it is larger than the sum of its proper divisors (1).

161901945695179 is an equidigital number, since it uses as much as digits as its factorization.

161901945695179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165337200, while the sum is 73.

The spelling of 161901945695179 in words is "one hundred sixty-one trillion, nine hundred one billion, nine hundred forty-five million, six hundred ninety-five thousand, one hundred seventy-nine".