6899980664 has 8 divisors (see below), whose sum is σ = 12937463760. Its totient is φ = 3449990328.

The previous prime is 6899980639. The next prime is 6899980669. The reversal of 6899980664 is 4660899986.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6899980664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6899980669) by changing a digit.

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 as a sum of consecutive naturals, namely, 431248784 + ... + 431248799.

It is an arithmetic number, because the mean of its divisors is an integer number (1617182970).

Almost surely, 2^6899980664 is an apocalyptic number.

It is an amenable number.

6899980664 is a deficient number, since it is larger than the sum of its proper divisors (6037483096).

6899980664 is a wasteful number, since it uses less digits than its factorization.

6899980664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862497589 (or 862497585 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 65.

The square root of 6899980664 is about 83066.1222400564. The cubic root of 6899980664 is about 1903.7764836304.

The spelling of 6899980664 in words is "six billion, eight hundred ninety-nine million, nine hundred eighty thousand, six hundred sixty-four".