6663646365387 has 32 divisors (see below), whose sum is σ = 9788992093440. Its totient is φ = 3998404080000.

The previous prime is 6663646365323. The next prime is 6663646365403. The reversal of 6663646365387 is 7835636463666.

It is a happy number.

It is not a de Polignac number, because 6663646365387 - 2⁶ = 6663646365323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6663646361387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118396689 + ... + 118452957.

It is an arithmetic number, because the mean of its divisors is an integer number (305906002920).

Almost surely, 2^{6663646365387} is an apocalyptic number.

6663646365387 is a deficient number, since it is larger than the sum of its proper divisors (3125345728053).

6663646365387 is a wasteful number, since it uses less digits than its factorization.

6663646365387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91915.

The product of its digits is 1410877440, while the sum is 69.

The spelling of 6663646365387 in words is "six trillion, six hundred sixty-three billion, six hundred forty-six million, three hundred sixty-five thousand, three hundred eighty-seven".