665001161 has 4 divisors (see below), whose sum is σ = 725455824. Its totient is φ = 604546500.

The previous prime is 665001143. The next prime is 665001173. The reversal of 665001161 is 161100566.

665001161 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 665001161 - 2⁶ = 665001097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665001161.

It is not an unprimeable number, because it can be changed into a prime (665001061) 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, 30227315 + ... + 30227336.

It is an arithmetic number, because the mean of its divisors is an integer number (181363956).

Almost surely, 2^665001161 is an apocalyptic number.

It is an amenable number.

665001161 is a deficient number, since it is larger than the sum of its proper divisors (60454663).

665001161 is a wasteful number, since it uses less digits than its factorization.

665001161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60454662.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 665001161 is about 25787.6164272699. The cubic root of 665001161 is about 872.8523814787.

The spelling of 665001161 in words is "six hundred sixty-five million, one thousand, one hundred sixty-one".