6664012517 has 2 divisors, whose sum is σ = 6664012518. Its totient is φ = 6664012516.

The previous prime is 6664012471. The next prime is 6664012549. The reversal of 6664012517 is 7152104666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6643228036 + 20784481 = 81506^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664012517 - 2²² = 6659818213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664012567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332006258 + 3332006259.

It is an arithmetic number, because the mean of its divisors is an integer number (3332006259).

Almost surely, 2^6664012517 is an apocalyptic number.

It is an amenable number.

6664012517 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664012517 is an equidigital number, since it uses as much as digits as its factorization.

6664012517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 6664012517 is about 81633.4031937907. The cubic root of 6664012517 is about 1881.8222595628.

The spelling of 6664012517 in words is "six billion, six hundred sixty-four million, twelve thousand, five hundred seventeen".