8161165205217 has 8 divisors (see below), whose sum is σ = 12090615118880. Its totient is φ = 5440776803460.

The previous prime is 8161165205159. The next prime is 8161165205243. The reversal of 8161165205217 is 7125025611618.

8161165205217 is a `hidden beast` number, since 8 + 1 + 6 + 116 + 5 + 2 + 0 + 521 + 7 = 666.

It is not a de Polignac number, because 8161165205217 - 2⁶ = 8161165205153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8161165205617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151132688959 + ... + 151132689012.

It is an arithmetic number, because the mean of its divisors is an integer number (1511326889860).

Almost surely, 2^{8161165205217} is an apocalyptic number.

It is an amenable number.

8161165205217 is a deficient number, since it is larger than the sum of its proper divisors (3929449913663).

8161165205217 is a wasteful number, since it uses less digits than its factorization.

8161165205217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302265377980 (or 302265377974 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 8161165205217 in words is "eight trillion, one hundred sixty-one billion, one hundred sixty-five million, two hundred five thousand, two hundred seventeen".