1161296665 has 4 divisors (see below), whose sum is σ = 1393556004. Its totient is φ = 929037328.

The previous prime is 1161296659. The next prime is 1161296671. The reversal of 1161296665 is 5666921611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5666921611 = 13 ⋅435917047.

It is an interprime number because it is at equal distance from previous prime (1161296659) and next prime (1161296671).

It can be written as a sum of positive squares in 2 ways, for example, as 875923216 + 285373449 = 29596^2 + 16893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161296665 is a prime.

It is a Duffinian 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, 116129662 + ... + 116129671.

It is an arithmetic number, because the mean of its divisors is an integer number (348389001).

Almost surely, 2^1161296665 is an apocalyptic number.

It is an amenable number.

1161296665 is a deficient number, since it is larger than the sum of its proper divisors (232259339).

1161296665 is an equidigital number, since it uses as much as digits as its factorization.

1161296665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232259338.

The product of its digits is 116640, while the sum is 43.

The square root of 1161296665 is about 34077.8031128769. The cubic root of 1161296665 is about 1051.1089312144.

The spelling of 1161296665 in words is "one billion, one hundred sixty-one million, two hundred ninety-six thousand, six hundred sixty-five".