1165165641 has 10 divisors (see below), whose sum is σ = 1740556202. Its totient is φ = 776777040.

The previous prime is 1165165613. The next prime is 1165165681. The reversal of 1165165641 is 1465615611.

1165165641 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 1 + 6 + 5 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 852406416 + 312759225 = 29196^2 + 17685^2 .

It is not a de Polignac number, because 1165165641 - 2⁹ = 1165165129 is a prime.

It is a super-2 number, since 2×1165165641² = 2715221941933881762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165165596 and 1165165605.

It is not an unprimeable number, because it can be changed into a prime (1165165681) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7192300 + ... + 7192461.

Almost surely, 2^1165165641 is an apocalyptic number.

It is an amenable number.

1165165641 is a deficient number, since it is larger than the sum of its proper divisors (575390561).

1165165641 is an equidigital number, since it uses as much as digits as its factorization.

1165165641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14384773 (or 14384764 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1165165641 is about 34134.5227152805. The cubic root of 1165165641 is about 1052.2749288067.

The spelling of 1165165641 in words is "one billion, one hundred sixty-five million, one hundred sixty-five thousand, six hundred forty-one".