3656666563 has 4 divisors (see below), whose sum is σ = 3989090808. Its totient is φ = 3324242320.

The previous prime is 3656666537. The next prime is 3656666581.

3656666563 is nontrivially palindromic in base 10.

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 3656666563 - 2¹³ = 3656658371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3656666563.

It is not an unprimeable number, because it can be changed into a prime (3656666513) 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, 166212106 + ... + 166212127.

It is an arithmetic number, because the mean of its divisors is an integer number (997272702).

Almost surely, 2^3656666563 is an apocalyptic number.

3656666563 is a deficient number, since it is larger than the sum of its proper divisors (332424245).

3656666563 is a wasteful number, since it uses less digits than its factorization.

3656666563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332424244.

The product of its digits is 10497600, while the sum is 52.

The square root of 3656666563 is about 60470.3775662101. The cubic root of 3656666563 is about 1540.6185409546.

The spelling of 3656666563 in words is "three billion, six hundred fifty-six million, six hundred sixty-six thousand, five hundred sixty-three".