66213659 has 2 divisors, whose sum is σ = 66213660. Its totient is φ = 66213658.

The previous prime is 66213643. The next prime is 66213671. The reversal of 66213659 is 95631266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66213659 - 2⁴ = 66213643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66213629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106829 + 33106830.

It is an arithmetic number, because the mean of its divisors is an integer number (33106830).

Almost surely, 2^66213659 is an apocalyptic number.

66213659 is a deficient number, since it is larger than the sum of its proper divisors (1).

66213659 is an equidigital number, since it uses as much as digits as its factorization.

66213659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 38.

The square root of 66213659 is about 8137.1775819383. The cubic root of 66213659 is about 404.5596168298.

The spelling of 66213659 in words is "sixty-six million, two hundred thirteen thousand, six hundred fifty-nine".