161942810815 has 16 divisors (see below), whose sum is σ = 205772557248. Its totient is φ = 121927527936.

The previous prime is 161942810807. The next prime is 161942810819. The reversal of 161942810815 is 518018249161.

It is a cyclic number.

It is not a de Polignac number, because 161942810815 - 2³ = 161942810807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161942810819) 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, 2653534 + ... + 2713876.

It is an arithmetic number, because the mean of its divisors is an integer number (12860784828).

Almost surely, 2^161942810815 is an apocalyptic number.

161942810815 is a deficient number, since it is larger than the sum of its proper divisors (43829746433).

161942810815 is a wasteful number, since it uses less digits than its factorization.

161942810815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91938.

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 161942810815 in words is "one hundred sixty-one billion, nine hundred forty-two million, eight hundred ten thousand, eight hundred fifteen".