6623876921 has 8 divisors (see below), whose sum is σ = 6890572800. Its totient is φ = 6359733520.

The previous prime is 6623876879. The next prime is 6623876933. The reversal of 6623876921 is 1296783266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6623876921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6623876921.

It is not an unprimeable number, because it can be changed into a prime (6623876971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632825 + ... + 643206.

It is an arithmetic number, because the mean of its divisors is an integer number (861321600).

Almost surely, 2^6623876921 is an apocalyptic number.

It is an amenable number.

6623876921 is a deficient number, since it is larger than the sum of its proper divisors (266695879).

6623876921 is a wasteful number, since it uses less digits than its factorization.

6623876921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276239.

The product of its digits is 1306368, while the sum is 50.

The square root of 6623876921 is about 81387.2036686358. The cubic root of 6623876921 is about 1878.0367426690.

The spelling of 6623876921 in words is "six billion, six hundred twenty-three million, eight hundred seventy-six thousand, nine hundred twenty-one".