3657642865 has 4 divisors (see below), whose sum is σ = 4389171444. Its totient is φ = 2926114288.

The previous prime is 3657642829. The next prime is 3657642869. The reversal of 3657642865 is 5682467563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1441493089 + 2216149776 = 37967^2 + 47076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3657642865 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3657642869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365764282 + ... + 365764291.

It is an arithmetic number, because the mean of its divisors is an integer number (1097292861).

Almost surely, 2^3657642865 is an apocalyptic number.

It is an amenable number.

3657642865 is a deficient number, since it is larger than the sum of its proper divisors (731528579).

3657642865 is an equidigital number, since it uses as much as digits as its factorization.

3657642865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731528578.

The product of its digits is 7257600, while the sum is 52.

The square root of 3657642865 is about 60478.4495915694. The cubic root of 3657642865 is about 1540.7556398756.

The spelling of 3657642865 in words is "three billion, six hundred fifty-seven million, six hundred forty-two thousand, eight hundred sixty-five".