3639131645 has 8 divisors (see below), whose sum is σ = 4556825856. Its totient is φ = 2784726736.

The previous prime is 3639131641. The next prime is 3639131647. The reversal of 3639131645 is 5461319363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3639131645 - 2² = 3639131641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639131641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15822197 + ... + 15822426.

It is an arithmetic number, because the mean of its divisors is an integer number (569603232).

Almost surely, 2^3639131645 is an apocalyptic number.

It is an amenable number.

3639131645 is a deficient number, since it is larger than the sum of its proper divisors (917694211).

3639131645 is a wasteful number, since it uses less digits than its factorization.

3639131645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31644651.

The product of its digits is 174960, while the sum is 41.

The square root of 3639131645 is about 60325.2156647616. The cubic root of 3639131645 is about 1538.1520033716.

The spelling of 3639131645 in words is "three billion, six hundred thirty-nine million, one hundred thirty-one thousand, six hundred forty-five".