3656564647 has 4 divisors (see below), whose sum is σ = 3658244920. Its totient is φ = 3654884376.

The previous prime is 3656564591. The next prime is 3656564713. The reversal of 3656564647 is 7464656563.

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

It is a cyclic number.

It is not a de Polignac number, because 3656564647 - 2⁷ = 3656564519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3656564594 and 3656564603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656564347) 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, 836868 + ... + 841225.

It is an arithmetic number, because the mean of its divisors is an integer number (914561230).

Almost surely, 2^3656564647 is an apocalyptic number.

3656564647 is a deficient number, since it is larger than the sum of its proper divisors (1680273).

3656564647 is a wasteful number, since it uses less digits than its factorization.

3656564647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680272.

The product of its digits is 10886400, while the sum is 52.

The square root of 3656564647 is about 60469.5348667410. The cubic root of 3656564647 is about 1540.6042278150.

The spelling of 3656564647 in words is "three billion, six hundred fifty-six million, five hundred sixty-four thousand, six hundred forty-seven".