161802855 has 24 divisors (see below), whose sum is σ = 296957232. Its totient is φ = 81218304.

The previous prime is 161802829. The next prime is 161802859. The reversal of 161802855 is 558208161.

It is not a de Polignac number, because 161802855 - 2⁶ = 161802791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161802859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104989 + ... + 106518.

It is an arithmetic number, because the mean of its divisors is an integer number (12373218).

Almost surely, 2^161802855 is an apocalyptic number.

161802855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161802855 is a deficient number, since it is larger than the sum of its proper divisors (135154377).

161802855 is a wasteful number, since it uses less digits than its factorization.

161802855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211535 (or 211532 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 161802855 is about 12720.1751167191. The cubic root of 161802855 is about 544.9149546055.

The spelling of 161802855 in words is "one hundred sixty-one million, eight hundred two thousand, eight hundred fifty-five".