66408579 has 40 divisors (see below), whose sum is σ = 108725760. Its totient is φ = 40207104.

The previous prime is 66408569. The next prime is 66408583. The reversal of 66408579 is 97580466.

66408579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66408579 - 2¹² = 66404483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66408569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39102 + ... + 40764.

It is an arithmetic number, because the mean of its divisors is an integer number (2718144).

Almost surely, 2^66408579 is an apocalyptic number.

66408579 is a deficient number, since it is larger than the sum of its proper divisors (42317181).

66408579 is a wasteful number, since it uses less digits than its factorization.

66408579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 66408579 is about 8149.1459061671. The cubic root of 66408579 is about 404.9562092571.

The spelling of 66408579 in words is "sixty-six million, four hundred eight thousand, five hundred seventy-nine".