161856655 has 8 divisors (see below), whose sum is σ = 194395392. Its totient is φ = 129373728.

The previous prime is 161856637. The next prime is 161856671. The reversal of 161856655 is 556658161.

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

It is not a de Polignac number, because 161856655 - 2¹¹ = 161854607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7279 + ... + 19408.

It is an arithmetic number, because the mean of its divisors is an integer number (24299424).

Almost surely, 2^161856655 is an apocalyptic number.

161856655 is a deficient number, since it is larger than the sum of its proper divisors (32538737).

161856655 is a wasteful number, since it uses less digits than its factorization.

161856655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27905.

The product of its digits is 216000, while the sum is 43.

The square root of 161856655 is about 12722.2896917182. The cubic root of 161856655 is about 544.9753432719.

The spelling of 161856655 in words is "one hundred sixty-one million, eight hundred fifty-six thousand, six hundred fifty-five".