3215765665 has 16 divisors (see below), whose sum is σ = 4421726208. Its totient is φ = 2199329856.

The previous prime is 3215765629. The next prime is 3215765681. The reversal of 3215765665 is 5665675123.

It is a cyclic number.

It is not a de Polignac number, because 3215765665 - 2⁹ = 3215765153 is a prime.

It is a super-2 number, since 2×3215765665² = 20682297624385784450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106542 + ... + 133351.

It is an arithmetic number, because the mean of its divisors is an integer number (276357888).

Almost surely, 2^3215765665 is an apocalyptic number.

3215765665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3215765665 is a deficient number, since it is larger than the sum of its proper divisors (1205960543).

3215765665 is a wasteful number, since it uses less digits than its factorization.

3215765665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240288.

The product of its digits is 1134000, while the sum is 46.

The square root of 3215765665 is about 56707.7213878322. The cubic root of 3215765665 is about 1476.0286862238.

The spelling of 3215765665 in words is "three billion, two hundred fifteen million, seven hundred sixty-five thousand, six hundred sixty-five".