3668663643 has 4 divisors (see below), whose sum is σ = 4891551528. Its totient is φ = 2445775760.

The previous prime is 3668663639. The next prime is 3668663653. The reversal of 3668663643 is 3463668663.

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 3668663643 - 2² = 3668663639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3668663653) 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, 611443938 + ... + 611443943.

It is an arithmetic number, because the mean of its divisors is an integer number (1222887882).

Almost surely, 2^3668663643 is an apocalyptic number.

3668663643 is a deficient number, since it is larger than the sum of its proper divisors (1222887885).

3668663643 is a wasteful number, since it uses less digits than its factorization.

3668663643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222887884.

The product of its digits is 6718464, while the sum is 51.

The square root of 3668663643 is about 60569.4943267649. The cubic root of 3668663643 is about 1542.3015626283.

The spelling of 3668663643 in words is "three billion, six hundred sixty-eight million, six hundred sixty-three thousand, six hundred forty-three".