66302409 has 16 divisors (see below), whose sum is σ = 91953920. Its totient is φ = 42456960.

The previous prime is 66302407. The next prime is 66302413. The reversal of 66302409 is 90420366.

It is not a de Polignac number, because 66302409 - 2¹ = 66302407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66302407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4989 + ... + 12549.

It is an arithmetic number, because the mean of its divisors is an integer number (5747120).

Almost surely, 2^66302409 is an apocalyptic number.

It is an amenable number.

66302409 is a deficient number, since it is larger than the sum of its proper divisors (25651511).

66302409 is a wasteful number, since it uses less digits than its factorization.

66302409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66302409 is about 8142.6291208675. The cubic root of 66302409 is about 404.7402876903.

The spelling of 66302409 in words is "sixty-six million, three hundred two thousand, four hundred nine".