66420559 has 2 divisors, whose sum is σ = 66420560. Its totient is φ = 66420558.

The previous prime is 66420553. The next prime is 66420671. The reversal of 66420559 is 95502466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66420559 - 2¹¹ = 66418511 is a prime.

It is equal to p_3919627 and since 66420559 and 3919627 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66420553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33210279 + 33210280.

It is an arithmetic number, because the mean of its divisors is an integer number (33210280).

Almost surely, 2^66420559 is an apocalyptic number.

66420559 is a deficient number, since it is larger than the sum of its proper divisors (1).

66420559 is an equidigital number, since it uses as much as digits as its factorization.

66420559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 66420559 is about 8149.8809193754. The cubic root of 66420559 is about 404.9805589408.

The spelling of 66420559 in words is "sixty-six million, four hundred twenty thousand, five hundred fifty-nine".