161658418 has 16 divisors (see below), whose sum is σ = 247216320. Its totient is φ = 79261200.

The previous prime is 161658391. The next prime is 161658451. The reversal of 161658418 is 814856161.

It is a super-2 number, since 2×161658418² = 52266888220525448, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 41953 + ... + 45643.

It is an arithmetic number, because the mean of its divisors is an integer number (15451020).

Almost surely, 2^161658418 is an apocalyptic number.

161658418 is a deficient number, since it is larger than the sum of its proper divisors (85557902).

161658418 is a wasteful number, since it uses less digits than its factorization.

161658418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113.

The product of its digits is 46080, while the sum is 40.

The square root of 161658418 is about 12714.4963722516. The cubic root of 161658418 is about 544.7527627570.

The spelling of 161658418 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, four hundred eighteen".