66293999 has 12 divisors (see below), whose sum is σ = 70850688. Its totient is φ = 62016000.

The previous prime is 66293989. The next prime is 66294013. The reversal of 66293999 is 99939266.

It is a happy number.

It is not a de Polignac number, because 66293999 - 2⁸ = 66293743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66293999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66293939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54599 + ... + 55799.

It is an arithmetic number, because the mean of its divisors is an integer number (5904224).

Almost surely, 2^66293999 is an apocalyptic number.

66293999 is a deficient number, since it is larger than the sum of its proper divisors (4556689).

66293999 is a wasteful number, since it uses less digits than its factorization.

66293999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426 (or 1409 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 53.

The square root of 66293999 is about 8142.1126865206. The cubic root of 66293999 is about 404.7231741354.

The spelling of 66293999 in words is "sixty-six million, two hundred ninety-three thousand, nine hundred ninety-nine".