161165777 has 4 divisors (see below), whose sum is σ = 161502720. Its totient is φ = 160828836.

The previous prime is 161165743. The next prime is 161165783. The reversal of 161165777 is 777561161.

161165777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161165777 - 2⁶ = 161165713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161165077) 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, 167753 + ... + 168710.

It is an arithmetic number, because the mean of its divisors is an integer number (40375680).

Almost surely, 2^161165777 is an apocalyptic number.

It is an amenable number.

161165777 is a deficient number, since it is larger than the sum of its proper divisors (336943).

161165777 is an equidigital number, since it uses as much as digits as its factorization.

161165777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336942.

The product of its digits is 61740, while the sum is 41.

The square root of 161165777 is about 12695.1083886669. The cubic root of 161165777 is about 544.1988363132.

The spelling of 161165777 in words is "one hundred sixty-one million, one hundred sixty-five thousand, seven hundred seventy-seven".