161775763 has 4 divisors (see below), whose sum is σ = 166994368. Its totient is φ = 156557160.

The previous prime is 161775751. The next prime is 161775781. The reversal of 161775763 is 367577161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367577161 = 7 ⋅52511023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161775763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161775703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2609256 + ... + 2609317.

It is an arithmetic number, because the mean of its divisors is an integer number (41748592).

Almost surely, 2^161775763 is an apocalyptic number.

161775763 is a deficient number, since it is larger than the sum of its proper divisors (5218605).

161775763 is an equidigital number, since it uses as much as digits as its factorization.

161775763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218604.

The product of its digits is 185220, while the sum is 43.

The square root of 161775763 is about 12719.1101496921. The cubic root of 161775763 is about 544.8845396911.

The spelling of 161775763 in words is "one hundred sixty-one million, seven hundred seventy-five thousand, seven hundred sixty-three".