161686874 has 8 divisors (see below), whose sum is σ = 244136928. Its totient is φ = 80307900.

The previous prime is 161686859. The next prime is 161686883. The reversal of 161686874 is 478686161.

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

It is a super-3 number, since 3×161686874³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 267392 + ... + 267995.

It is an arithmetic number, because the mean of its divisors is an integer number (30517116).

Almost surely, 2^161686874 is an apocalyptic number.

161686874 is a deficient number, since it is larger than the sum of its proper divisors (82450054).

161686874 is a wasteful number, since it uses less digits than its factorization.

161686874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535540.

The product of its digits is 387072, while the sum is 47.

The square root of 161686874 is about 12715.6153606501. The cubic root of 161686874 is about 544.7847243365.

The spelling of 161686874 in words is "one hundred sixty-one million, six hundred eighty-six thousand, eight hundred seventy-four".