161816855 has 16 divisors (see below), whose sum is σ = 196862400. Its totient is φ = 127675392.

The previous prime is 161816801. The next prime is 161816861. The reversal of 161816855 is 558618161.

It is a cyclic number.

It is not a de Polignac number, because 161816855 - 2¹⁶ = 161751319 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269846 + ... + 270444.

It is an arithmetic number, because the mean of its divisors is an integer number (12303900).

Almost surely, 2^161816855 is an apocalyptic number.

161816855 is a deficient number, since it is larger than the sum of its proper divisors (35045545).

161816855 is an equidigital number, since it uses as much as digits as its factorization.

161816855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its digits is 57600, while the sum is 41.

The square root of 161816855 is about 12720.7254117051. The cubic root of 161816855 is about 544.9306704167.

The spelling of 161816855 in words is "one hundred sixty-one million, eight hundred sixteen thousand, eight hundred fifty-five".