161868215 has 8 divisors (see below), whose sum is σ = 194348160. Its totient is φ = 129423712.

The previous prime is 161868173. The next prime is 161868221. The reversal of 161868215 is 512868161.

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

It is a cyclic number.

It is not a de Polignac number, because 161868215 - 2¹⁰ = 161867191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2522 + ... + 18168.

It is an arithmetic number, because the mean of its divisors is an integer number (24293520).

Almost surely, 2^161868215 is an apocalyptic number.

161868215 is a deficient number, since it is larger than the sum of its proper divisors (32479945).

161868215 is a wasteful number, since it uses less digits than its factorization.

161868215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17721.

The product of its digits is 23040, while the sum is 38.

The square root of 161868215 is about 12722.7440043412. The cubic root of 161868215 is about 544.9883172313.

The spelling of 161868215 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, two hundred fifteen".