66993459 has 12 divisors (see below), whose sum is σ = 96725016. Its totient is φ = 41226432.

The previous prime is 66993439. The next prime is 66993461. The reversal of 66993459 is 95439966.

It is a happy number.

It is not a de Polignac number, because 66993459 - 2⁷ = 66993331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66993439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65562 + ... + 66575.

It is an arithmetic number, because the mean of its divisors is an integer number (8060418).

Almost surely, 2^66993459 is an apocalyptic number.

66993459 is a deficient number, since it is larger than the sum of its proper divisors (29731557).

66993459 is a wasteful number, since it uses less digits than its factorization.

66993459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132166 (or 132153 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 51.

The square root of 66993459 is about 8184.9532069524. The cubic root of 66993459 is about 406.1415924074.

The spelling of 66993459 in words is "sixty-six million, nine hundred ninety-three thousand, four hundred fifty-nine".