161539400017 has 16 divisors (see below), whose sum is σ = 165727586304. Its totient is φ = 157383250000.

The previous prime is 161539399951. The next prime is 161539400159. The reversal of 161539400017 is 710004935161.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161539400017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161539400317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31979142 + ... + 31984192.

It is an arithmetic number, because the mean of its divisors is an integer number (10357974144).

Almost surely, 2^161539400017 is an apocalyptic number.

It is an amenable number.

161539400017 is a deficient number, since it is larger than the sum of its proper divisors (4188186287).

161539400017 is a wasteful number, since it uses less digits than its factorization.

161539400017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8060.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 161539400017 in words is "one hundred sixty-one billion, five hundred thirty-nine million, four hundred thousand, seventeen".