1063660665 has 32 divisors (see below), whose sum is σ = 1719244800. Its totient is φ = 561516480.

The previous prime is 1063660651. The next prime is 1063660669. The reversal of 1063660665 is 5660663601.

It is not a de Polignac number, because 1063660665 - 2¹⁹ = 1063136377 is a prime.

It is a super-2 number, since 2×1063660665² = 2262748020536484450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1063660669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1023216 + ... + 1024254.

It is an arithmetic number, because the mean of its divisors is an integer number (53726400).

Almost surely, 2^1063660665 is an apocalyptic number.

1063660665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1063660665 is a deficient number, since it is larger than the sum of its proper divisors (655584135).

1063660665 is a wasteful number, since it uses less digits than its factorization.

1063660665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 1063660665 is about 32613.8109548700. The cubic root of 1063660665 is about 1020.7852037321.

The spelling of 1063660665 in words is "one billion, sixty-three million, six hundred sixty thousand, six hundred sixty-five".