161918086 has 24 divisors (see below), whose sum is σ = 267649200. Its totient is φ = 73410480.

The previous prime is 161918069. The next prime is 161918089. The reversal of 161918086 is 680819161.

161918086 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161918089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144400 + ... + 145516.

It is an arithmetic number, because the mean of its divisors is an integer number (11152050).

Almost surely, 2^161918086 is an apocalyptic number.

161918086 is a deficient number, since it is larger than the sum of its proper divisors (105731114).

161918086 is a wasteful number, since it uses less digits than its factorization.

161918086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 161918086 is about 12724.7037686541. The cubic root of 161918086 is about 545.0442811144.

The spelling of 161918086 in words is "one hundred sixty-one million, nine hundred eighteen thousand, eighty-six".