6624764921 has 2 divisors, whose sum is σ = 6624764922. Its totient is φ = 6624764920.

The previous prime is 6624764899. The next prime is 6624764983. The reversal of 6624764921 is 1294674266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6345874921 + 278890000 = 79661^2 + 16700^2 .

It is a cyclic number.

It is not a de Polignac number, because 6624764921 - 2¹⁰ = 6624763897 is a prime.

It is a super-3 number, since 3×6624764921³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6624764021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312382460 + 3312382461.

It is an arithmetic number, because the mean of its divisors is an integer number (3312382461).

Almost surely, 2^6624764921 is an apocalyptic number.

It is an amenable number.

6624764921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6624764921 is an equidigital number, since it uses as much as digits as its factorization.

6624764921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 47.

The square root of 6624764921 is about 81392.6588888703. The cubic root of 6624764921 is about 1878.1206624101.

The spelling of 6624764921 in words is "six billion, six hundred twenty-four million, seven hundred sixty-four thousand, nine hundred twenty-one".