6621323691 has 16 divisors (see below), whose sum is σ = 8876504448. Its totient is φ = 4390209600.

The previous prime is 6621323677. The next prime is 6621323713. The reversal of 6621323691 is 1963231266.

6621323691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6621323691 - 2⁶ = 6621323627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6621322691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219615 + ... + 1225031.

It is an arithmetic number, because the mean of its divisors is an integer number (554781528).

Almost surely, 2^6621323691 is an apocalyptic number.

6621323691 is a deficient number, since it is larger than the sum of its proper divisors (2255180757).

6621323691 is a wasteful number, since it uses less digits than its factorization.

6621323691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7562.

The product of its digits is 69984, while the sum is 39.

The square root of 6621323691 is about 81371.5164599997. The cubic root of 6621323691 is about 1877.7954098845.

The spelling of 6621323691 in words is "six billion, six hundred twenty-one million, three hundred twenty-three thousand, six hundred ninety-one".