3651660565 has 12 divisors (see below), whose sum is σ = 5097420396. Its totient is φ = 2503995648.

The previous prime is 3651660533. The next prime is 3651660581. The reversal of 3651660565 is 5650661563.

It can be written as a sum of positive squares in 2 ways, for example, as 438357969 + 3213302596 = 20937^2 + 56686^2 .

It is not a de Polignac number, because 3651660565 - 2⁵ = 3651660533 is a prime.

It is a super-2 number, since 2×3651660565² = 26669249763952238450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7452124 + ... + 7452613.

It is an arithmetic number, because the mean of its divisors is an integer number (424785033).

Almost surely, 2^3651660565 is an apocalyptic number.

3651660565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3651660565 is a deficient number, since it is larger than the sum of its proper divisors (1445759831).

3651660565 is a wasteful number, since it uses less digits than its factorization.

3651660565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904756 (or 14904749 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 3651660565 is about 60428.9712389678. The cubic root of 3651660565 is about 1539.9151812789.

The spelling of 3651660565 in words is "three billion, six hundred fifty-one million, six hundred sixty thousand, five hundred sixty-five".