161105040 has 60 divisors (see below), whose sum is σ = 541046844. Its totient is φ = 42961152.

The previous prime is 161105033. The next prime is 161105053. The reversal of 161105040 is 40501161.

161105040 is a `hidden beast` number, since 1 + 611 + 0 + 50 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 95883264 + 65221776 = 9792^2 + 8076^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111159 + ... + 112598.

Almost surely, 2^161105040 is an apocalyptic number.

161105040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161105040 is an abundant number, since it is smaller than the sum of its proper divisors (379941804).

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

161105040 is a wasteful number, since it uses less digits than its factorization.

161105040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223776 (or 223767 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161105040 is about 12692.7160214038. The cubic root of 161105040 is about 544.1304653925.

The spelling of 161105040 in words is "one hundred sixty-one million, one hundred five thousand, forty".