66464709 has 8 divisors (see below), whose sum is σ = 88815360. Its totient is φ = 44211936.

The previous prime is 66464701. The next prime is 66464759. The reversal of 66464709 is 90746466.

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

It is not a de Polignac number, because 66464709 - 2³ = 66464701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66464701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22869 + ... + 25610.

It is an arithmetic number, because the mean of its divisors is an integer number (11101920).

Almost surely, 2^66464709 is an apocalyptic number.

It is an amenable number.

66464709 is a deficient number, since it is larger than the sum of its proper divisors (22350651).

66464709 is a wasteful number, since it uses less digits than its factorization.

66464709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48939.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 66464709 is about 8152.5890979492. The cubic root of 66464709 is about 405.0702697763.

The spelling of 66464709 in words is "sixty-six million, four hundred sixty-four thousand, seven hundred nine".