66470609 has 4 divisors (see below), whose sum is σ = 66716160. Its totient is φ = 66225060.

The previous prime is 66470587. The next prime is 66470617. The reversal of 66470609 is 90607466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66470609 - 2⁸ = 66470353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66470659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122369 + ... + 122910.

It is an arithmetic number, because the mean of its divisors is an integer number (16679040).

Almost surely, 2^66470609 is an apocalyptic number.

It is an amenable number.

66470609 is a deficient number, since it is larger than the sum of its proper divisors (245551).

66470609 is a wasteful number, since it uses less digits than its factorization.

66470609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245550.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66470609 is about 8152.9509381573. The cubic root of 66470609 is about 405.0822553042.

The spelling of 66470609 in words is "sixty-six million, four hundred seventy thousand, six hundred nine".