6628564973 has 2 divisors, whose sum is σ = 6628564974. Its totient is φ = 6628564972.

The previous prime is 6628564967. The next prime is 6628565087. The reversal of 6628564973 is 3794658266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3335871049 + 3292693924 = 57757^2 + 57382^2 .

It is a cyclic number.

It is not a de Polignac number, because 6628564973 - 2⁶ = 6628564909 is a prime.

It is a super-3 number, since 3×6628564973³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6628564933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3314282486 + 3314282487.

It is an arithmetic number, because the mean of its divisors is an integer number (3314282487).

Almost surely, 2^6628564973 is an apocalyptic number.

It is an amenable number.

6628564973 is a deficient number, since it is larger than the sum of its proper divisors (1).

6628564973 is an equidigital number, since it uses as much as digits as its factorization.

6628564973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 56.

The square root of 6628564973 is about 81415.9994902722. Note that the first 3 decimals coincide. The cubic root of 6628564973 is about 1878.4796986467.

The spelling of 6628564973 in words is "six billion, six hundred twenty-eight million, five hundred sixty-four thousand, nine hundred seventy-three".