66904459 has 2 divisors, whose sum is σ = 66904460. Its totient is φ = 66904458.

The previous prime is 66904457. The next prime is 66904471. The reversal of 66904459 is 95440966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66904459 - 2¹ = 66904457 is a prime.

Together with 66904457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66904457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33452229 + 33452230.

It is an arithmetic number, because the mean of its divisors is an integer number (33452230).

Almost surely, 2^66904459 is an apocalyptic number.

66904459 is a deficient number, since it is larger than the sum of its proper divisors (1).

66904459 is an equidigital number, since it uses as much as digits as its factorization.

66904459 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 66904459 is about 8179.5145943998. The cubic root of 66904459 is about 405.9616613073.

The spelling of 66904459 in words is "sixty-six million, nine hundred four thousand, four hundred fifty-nine".