1165645663 has 24 divisors (see below), whose sum is σ = 1507390080. Its totient is φ = 892503360.

The previous prime is 1165645631. The next prime is 1165645717. The reversal of 1165645663 is 3665465611.

It is not a de Polignac number, because 1165645663 - 2⁵ = 1165645631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165645363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9768 + ... + 49261.

It is an arithmetic number, because the mean of its divisors is an integer number (62807920).

Almost surely, 2^1165645663 is an apocalyptic number.

1165645663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1165645663 is a deficient number, since it is larger than the sum of its proper divisors (341744417).

1165645663 is a wasteful number, since it uses less digits than its factorization.

1165645663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59087 (or 59080 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 1165645663 is about 34141.5533185003. The cubic root of 1165645663 is about 1052.4194134901.

The spelling of 1165645663 in words is "one billion, one hundred sixty-five million, six hundred forty-five thousand, six hundred sixty-three".