66311409 has 8 divisors (see below), whose sum is σ = 88457632. Its totient is φ = 44186400.

The previous prime is 66311393. The next prime is 66311417. The reversal of 66311409 is 90411366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66311409 - 2⁴ = 66311393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66311489) 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 7 ways as a sum of consecutive naturals, for example, 4677 + ... + 12429.

It is an arithmetic number, because the mean of its divisors is an integer number (11057204).

Almost surely, 2^66311409 is an apocalyptic number.

It is an amenable number.

66311409 is a deficient number, since it is larger than the sum of its proper divisors (22146223).

66311409 is a wasteful number, since it uses less digits than its factorization.

66311409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 66311409 is about 8143.1817491691. The cubic root of 66311409 is about 404.7586002364.

The spelling of 66311409 in words is "sixty-six million, three hundred eleven thousand, four hundred nine".