6625564217 has 2 divisors, whose sum is σ = 6625564218. Its totient is φ = 6625564216.

The previous prime is 6625564201. The next prime is 6625564223. The reversal of 6625564217 is 7124655266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5670692416 + 954871801 = 75304^2 + 30901^2 .

It is a cyclic number.

It is not a de Polignac number, because 6625564217 - 2⁴ = 6625564201 is a prime.

It is not a weakly prime, because it can be changed into another prime (6625564247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312782108 + 3312782109.

It is an arithmetic number, because the mean of its divisors is an integer number (3312782109).

Almost surely, 2^6625564217 is an apocalyptic number.

It is an amenable number.

6625564217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6625564217 is an equidigital number, since it uses as much as digits as its factorization.

6625564217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 44.

The square root of 6625564217 is about 81397.5688641866. The cubic root of 6625564217 is about 1878.1961928368.

The spelling of 6625564217 in words is "six billion, six hundred twenty-five million, five hundred sixty-four thousand, two hundred seventeen".