161550555 has 32 divisors (see below), whose sum is σ = 264211200. Its totient is φ = 84266112.

The previous prime is 161550539. The next prime is 161550581. The reversal of 161550555 is 555055161.

It is not a de Polignac number, because 161550555 - 2⁴ = 161550539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244816 + ... + 245474.

It is an arithmetic number, because the mean of its divisors is an integer number (8256600).

Almost surely, 2^161550555 is an apocalyptic number.

161550555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161550555 is a deficient number, since it is larger than the sum of its proper divisors (102660645).

161550555 is a wasteful number, since it uses less digits than its factorization.

161550555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 161550555 is about 12710.2539313737. The cubic root of 161550555 is about 544.6315777273.

The spelling of 161550555 in words is "one hundred sixty-one million, five hundred fifty thousand, five hundred fifty-five".