161290355165 has 16 divisors (see below), whose sum is σ = 200252574000. Its totient is φ = 124564188672.

The previous prime is 161290355123. The next prime is 161290355207. The reversal of 161290355165 is 561553092161.

It is an interprime number because it is at equal distance from previous prime (161290355123) and next prime (161290355207).

It can be written as a sum of positive squares in 8 ways, for example, as 3251508484 + 158038846681 = 57022^2 + 397541^2 .

It is a cyclic number.

It is not a de Polignac number, because 161290355165 - 2²⁰ = 161289306589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927569 + ... + 1087641.

It is an arithmetic number, because the mean of its divisors is an integer number (12515785875).

Almost surely, 2^161290355165 is an apocalyptic number.

It is an amenable number.

161290355165 is a deficient number, since it is larger than the sum of its proper divisors (38962218835).

161290355165 is a wasteful number, since it uses less digits than its factorization.

161290355165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167056.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 161290355165 in words is "one hundred sixty-one billion, two hundred ninety million, three hundred fifty-five thousand, one hundred sixty-five".