161775894 has 16 divisors (see below), whose sum is σ = 369773568. Its totient is φ = 46221672.

The previous prime is 161775883. The next prime is 161775931. The reversal of 161775894 is 498577161.

It is a congruent number.

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, 1925862 + ... + 1925945.

It is an arithmetic number, because the mean of its divisors is an integer number (23110848).

Almost surely, 2^161775894 is an apocalyptic number.

161775894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161775894 is an abundant number, since it is smaller than the sum of its proper divisors (207997674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161775894 is a wasteful number, since it uses less digits than its factorization.

161775894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851819.

The product of its digits is 423360, while the sum is 48.

The square root of 161775894 is about 12719.1152994224. The cubic root of 161775894 is about 544.8846867668.

The spelling of 161775894 in words is "one hundred sixty-one million, seven hundred seventy-five thousand, eight hundred ninety-four".