161456404 has 6 divisors (see below), whose sum is σ = 282548714. Its totient is φ = 80728200.

The previous prime is 161456387. The next prime is 161456411. The reversal of 161456404 is 404654161.

It can be written as a sum of positive squares in only one way, i.e., 161340804 + 115600 = 12702^2 + 340^2 .

It is a super-2 number, since 2×161456404² = 52136340785222432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20182047 + ... + 20182054.

Almost surely, 2^161456404 is an apocalyptic number.

It is an amenable number.

161456404 is a deficient number, since it is larger than the sum of its proper divisors (121092310).

161456404 is a wasteful number, since it uses less digits than its factorization.

161456404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40364105 (or 40364103 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 161456404 is about 12706.5496496885. The cubic root of 161456404 is about 544.5257541512.

The spelling of 161456404 in words is "one hundred sixty-one million, four hundred fifty-six thousand, four hundred four".