66246517 has 2 divisors, whose sum is σ = 66246518. Its totient is φ = 66246516.

The previous prime is 66246511. The next prime is 66246553. The reversal of 66246517 is 71564266.

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., 61606801 + 4639716 = 7849^2 + 2154^2 .

It is a cyclic number.

It is not a de Polignac number, because 66246517 - 2²³ = 57857909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66246511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33123258 + 33123259.

It is an arithmetic number, because the mean of its divisors is an integer number (33123259).

Almost surely, 2^66246517 is an apocalyptic number.

It is an amenable number.

66246517 is a deficient number, since it is larger than the sum of its proper divisors (1).

66246517 is an equidigital number, since it uses as much as digits as its factorization.

66246517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 66246517 is about 8139.1963362484. The cubic root of 66246517 is about 404.6265255908.

The spelling of 66246517 in words is "sixty-six million, two hundred forty-six thousand, five hundred seventeen".