161292665 has 4 divisors (see below), whose sum is σ = 193551204. Its totient is φ = 129034128.

The previous prime is 161292643. The next prime is 161292671. The reversal of 161292665 is 566292161.

161292665 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.

It can be written as a sum of positive squares in 2 ways, for example, as 21603904 + 139688761 = 4648^2 + 11819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161292665 is a prime.

It is a Duffinian number.

It is a Curzon 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, 16129262 + ... + 16129271.

It is an arithmetic number, because the mean of its divisors is an integer number (48387801).

Almost surely, 2^161292665 is an apocalyptic number.

It is an amenable number.

161292665 is a deficient number, since it is larger than the sum of its proper divisors (32258539).

161292665 is an equidigital number, since it uses as much as digits as its factorization.

161292665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32258538.

The product of its digits is 38880, while the sum is 38.

The square root of 161292665 is about 12700.1049208264. The cubic root of 161292665 is about 544.3416172212.

The spelling of 161292665 in words is "one hundred sixty-one million, two hundred ninety-two thousand, six hundred sixty-five".