6646358765 has 16 divisors (see below), whose sum is σ = 8330774400. Its totient is φ = 5083885632.

The previous prime is 6646358759. The next prime is 6646358773. The reversal of 6646358765 is 5678536466.

It is a cyclic number.

It is not a de Polignac number, because 6646358765 - 2⁶ = 6646358701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6646358765.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207575 + ... + 237444.

It is an arithmetic number, because the mean of its divisors is an integer number (520673400).

Almost surely, 2^6646358765 is an apocalyptic number.

It is an amenable number.

6646358765 is a deficient number, since it is larger than the sum of its proper divisors (1684415635).

6646358765 is a wasteful number, since it uses less digits than its factorization.

6646358765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445156.

The product of its digits is 21772800, while the sum is 56.

The square root of 6646358765 is about 81525.2032502833. The cubic root of 6646358765 is about 1880.1590672901.

The spelling of 6646358765 in words is "six billion, six hundred forty-six million, three hundred fifty-eight thousand, seven hundred sixty-five".