161550918 has 24 divisors (see below), whose sum is σ = 350268048. Its totient is φ = 53813232.

The previous prime is 161550913. The next prime is 161550929. The reversal of 161550918 is 819055161.

161550918 is a `hidden beast` number, since 16 + 1 + 550 + 91 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161550911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40071 + ... + 43917.

It is an arithmetic number, because the mean of its divisors is an integer number (14594502).

Almost surely, 2^161550918 is an apocalyptic number.

161550918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161550918 is an abundant number, since it is smaller than the sum of its proper divisors (188717130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161550918 is a wasteful number, since it uses less digits than its factorization.

161550918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6188 (or 6185 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The square root of 161550918 is about 12710.2682111748. The cubic root of 161550918 is about 544.6319856514.

The spelling of 161550918 in words is "one hundred sixty-one million, five hundred fifty thousand, nine hundred eighteen".