161775455 has 4 divisors (see below), whose sum is σ = 194130552. Its totient is φ = 129420360.

The previous prime is 161775431. The next prime is 161775473. The reversal of 161775455 is 554577161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161775455 - 2²⁴ = 144998239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16177541 + ... + 16177550.

It is an arithmetic number, because the mean of its divisors is an integer number (48532638).

Almost surely, 2^161775455 is an apocalyptic number.

161775455 is a deficient number, since it is larger than the sum of its proper divisors (32355097).

161775455 is an equidigital number, since it uses as much as digits as its factorization.

161775455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32355096.

The product of its digits is 147000, while the sum is 41.

The square root of 161775455 is about 12719.0980419211. The cubic root of 161775455 is about 544.8841938944.

The spelling of 161775455 in words is "one hundred sixty-one million, seven hundred seventy-five thousand, four hundred fifty-five".