161837665 has 8 divisors (see below), whose sum is σ = 211860288. Its totient is φ = 117700080.

The previous prime is 161837657. The next prime is 161837699. The reversal of 161837665 is 566738161.

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

It is not a de Polignac number, because 161837665 - 2³ = 161837657 is a prime.

It is a Duffinian number.

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, 1471197 + ... + 1471306.

It is an arithmetic number, because the mean of its divisors is an integer number (26482536).

Almost surely, 2^161837665 is an apocalyptic number.

It is an amenable number.

161837665 is a deficient number, since it is larger than the sum of its proper divisors (50022623).

161837665 is a wasteful number, since it uses less digits than its factorization.

161837665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942519.

The product of its digits is 181440, while the sum is 43.

The square root of 161837665 is about 12721.5433419063. The cubic root of 161837665 is about 544.9540291724.

The spelling of 161837665 in words is "one hundred sixty-one million, eight hundred thirty-seven thousand, six hundred sixty-five".