161875018 has 8 divisors (see below), whose sum is σ = 246138948. Its totient is φ = 79828704.

The previous prime is 161875009. The next prime is 161875019. The reversal of 161875018 is 810578161.

It can be written as a sum of positive squares in 2 ways, for example, as 161874729 + 289 = 12723^2 + 17^2 .

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

It is not an unprimeable number, because it can be changed into a prime (161875019) 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, 554221 + ... + 554512.

Almost surely, 2^161875018 is an apocalyptic number.

161875018 is a deficient number, since it is larger than the sum of its proper divisors (84263930).

161875018 is a wasteful number, since it uses less digits than its factorization.

161875018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108808.

The product of its (nonzero) digits is 13440, while the sum is 37.

The square root of 161875018 is about 12723.0113573792. The cubic root of 161875018 is about 544.9959520503.

It can be divided in two parts, 1618 and 75018, that added together give a triangular number (76636 = T₃₉₁).

The spelling of 161875018 in words is "one hundred sixty-one million, eight hundred seventy-five thousand, eighteen".