66601947239 has 2 divisors, whose sum is σ = 66601947240. Its totient is φ = 66601947238.

The previous prime is 66601947197. The next prime is 66601947257. The reversal of 66601947239 is 93274910666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66601947239 - 2²⁴ = 66585170023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66601947289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300973619 + 33300973620.

It is an arithmetic number, because the mean of its divisors is an integer number (33300973620).

Almost surely, 2^66601947239 is an apocalyptic number.

66601947239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66601947239 is an equidigital number, since it uses as much as digits as its factorization.

66601947239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 66601947239 in words is "sixty-six billion, six hundred one million, nine hundred forty-seven thousand, two hundred thirty-nine".