66266957 has 2 divisors, whose sum is σ = 66266958. Its totient is φ = 66266956.

The previous prime is 66266939. The next prime is 66267049. The reversal of 66266957 is 75966266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55071241 + 11195716 = 7421^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 66266957 - 2²⁰ = 65218381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66266917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33133478 + 33133479.

It is an arithmetic number, because the mean of its divisors is an integer number (33133479).

Almost surely, 2^66266957 is an apocalyptic number.

It is an amenable number.

66266957 is a deficient number, since it is larger than the sum of its proper divisors (1).

66266957 is an equidigital number, since it uses as much as digits as its factorization.

66266957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 66266957 is about 8140.4518916335. The cubic root of 66266957 is about 404.6681364109.

The spelling of 66266957 in words is "sixty-six million, two hundred sixty-six thousand, nine hundred fifty-seven".