161090880890 has 16 divisors (see below), whose sum is σ = 307020267432. Its totient is φ = 60645978624.

The previous prime is 161090880883. The next prime is 161090880901. The reversal of 161090880890 is 98088090161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 109152926689 + 51937954201 = 330383^2 + 227899^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473796539 + ... + 473796878.

Almost surely, 2^161090880890 is an apocalyptic number.

161090880890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161090880890 is a deficient number, since it is larger than the sum of its proper divisors (145929386542).

161090880890 is a wasteful number, since it uses less digits than its factorization.

161090880890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947593441.

The product of its (nonzero) digits is 248832, while the sum is 50.

The spelling of 161090880890 in words is "one hundred sixty-one billion, ninety million, eight hundred eighty thousand, eight hundred ninety".