3653860665 has 64 divisors (see below), whose sum is σ = 7342272000. Its totient is φ = 1541820672.

The previous prime is 3653860631. The next prime is 3653860681. The reversal of 3653860665 is 5660683563.

It is not a de Polignac number, because 3653860665 - 2⁸ = 3653860409 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 39571 + ... + 94199.

It is an arithmetic number, because the mean of its divisors is an integer number (114723000).

Almost surely, 2^3653860665 is an apocalyptic number.

3653860665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3653860665 is an abundant number, since it is smaller than the sum of its proper divisors (3688411335).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3653860665 is a wasteful number, since it uses less digits than its factorization.

3653860665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54671 (or 54657 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The square root of 3653860665 is about 60447.1725145188. The cubic root of 3653860665 is about 1540.2243819060.

The spelling of 3653860665 in words is "three billion, six hundred fifty-three million, eight hundred sixty thousand, six hundred sixty-five".