66638059 has 2 divisors, whose sum is σ = 66638060. Its totient is φ = 66638058.

The previous prime is 66638053. The next prime is 66638063. The reversal of 66638059 is 95083666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66638059 - 2³ = 66638051 is a prime.

It is not a weakly prime, because it can be changed into another prime (66638051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33319029 + 33319030.

It is an arithmetic number, because the mean of its divisors is an integer number (33319030).

Almost surely, 2^66638059 is an apocalyptic number.

66638059 is a deficient number, since it is larger than the sum of its proper divisors (1).

66638059 is an equidigital number, since it uses as much as digits as its factorization.

66638059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 66638059 is about 8163.2137666485. The cubic root of 66638059 is about 405.4221255377.

The spelling of 66638059 in words is "sixty-six million, six hundred thirty-eight thousand, fifty-nine".