16161918 has 8 divisors (see below), whose sum is σ = 32323848. Its totient is φ = 5387304.

The previous prime is 16161907. The next prime is 16161923. The reversal of 16161918 is 81916161.

It is a sphenic number, since it is the product of 3 distinct primes.

16161918 is an admirable number.

It is a super-2 number, since 2×16161918² = 522415186877448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346821 + ... + 1346832.

It is an arithmetic number, because the mean of its divisors is an integer number (4040481).

Almost surely, 2^16161918 is an apocalyptic number.

16161918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16161918 is a wasteful number, since it uses less digits than its factorization.

16161918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693658.

The product of its digits is 2592, while the sum is 33.

The square root of 16161918 is about 4020.1888015366. The cubic root of 16161918 is about 252.8313748747.

The spelling of 16161918 in words is "sixteen million, one hundred sixty-one thousand, nine hundred eighteen".