161090880891 has 8 divisors (see below), whose sum is σ = 216479084544. Its totient is φ = 106548298920.

The previous prime is 161090880883. The next prime is 161090880901. The reversal of 161090880891 is 198088090161.

161090880891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161090880891 - 2³ = 161090880883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161090880791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211404975 + ... + 211405736.

It is an arithmetic number, because the mean of its divisors is an integer number (27059885568).

Almost surely, 2^161090880891 is an apocalyptic number.

161090880891 is a deficient number, since it is larger than the sum of its proper divisors (55388203653).

161090880891 is a wasteful number, since it uses less digits than its factorization.

161090880891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422810841.

The product of its (nonzero) digits is 248832, while the sum is 51.

The spelling of 161090880891 in words is "one hundred sixty-one billion, ninety million, eight hundred eighty thousand, eight hundred ninety-one".