161606404 has 12 divisors (see below), whose sum is σ = 284846800. Its totient is φ = 80221608.

The previous prime is 161606387. The next prime is 161606407. The reversal of 161606404 is 404606161.

It is a super-2 number, since 2×161606404² = 52233259627622432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161606407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144774 + ... + 145885.

Almost surely, 2^161606404 is an apocalyptic number.

It is an amenable number.

161606404 is a deficient number, since it is larger than the sum of its proper divisors (123240396).

161606404 is a wasteful number, since it uses less digits than its factorization.

161606404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290802 (or 290800 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 161606404 is about 12712.4507472006. The cubic root of 161606404 is about 544.6943313021.

The spelling of 161606404 in words is "one hundred sixty-one million, six hundred six thousand, four hundred four".