161654404 has 6 divisors (see below), whose sum is σ = 282895214. Its totient is φ = 80827200.

The previous prime is 161654371. The next prime is 161654407. The reversal of 161654404 is 404456161.

It can be written as a sum of positive squares in only one way, i.e., 161340804 + 313600 = 12702^2 + 560^2 .

It is a super-2 number, since 2×161654404² = 52264292665190432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161654407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20206797 + ... + 20206804.

Almost surely, 2^161654404 is an apocalyptic number.

It is an amenable number.

161654404 is a deficient number, since it is larger than the sum of its proper divisors (121240810).

161654404 is a wasteful number, since it uses less digits than its factorization.

161654404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40413605 (or 40413603 counting only the distinct ones).

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

The square root of 161654404 is about 12714.3385199545. The cubic root of 161654404 is about 544.7482539585.

The spelling of 161654404 in words is "one hundred sixty-one million, six hundred fifty-four thousand, four hundred four".