161545505 has 16 divisors (see below), whose sum is σ = 222609600. Its totient is φ = 111303360.

The previous prime is 161545499. The next prime is 161545513. The reversal of 161545505 is 505545161.

It is not a de Polignac number, because 161545505 - 2⁸ = 161545249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76250 + ... + 78339.

It is an arithmetic number, because the mean of its divisors is an integer number (13913100).

Almost surely, 2^161545505 is an apocalyptic number.

It is an amenable number.

161545505 is a deficient number, since it is larger than the sum of its proper divisors (61064095).

161545505 is a wasteful number, since it uses less digits than its factorization.

161545505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154624.

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 161545505 is about 12710.0552713196. The cubic root of 161545505 is about 544.6259026862.

The spelling of 161545505 in words is "one hundred sixty-one million, five hundred forty-five thousand, five hundred five".