66716464 has 30 divisors (see below), whose sum is σ = 133598220. Its totient is φ = 32274720.

The previous prime is 66716437. The next prime is 66716497. The reversal of 66716464 is 46461766.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13207 + ... + 17545.

It is an arithmetic number, because the mean of its divisors is an integer number (4453274).

Almost surely, 2^66716464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66716464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66799110).

66716464 is an abundant number, since it is smaller than the sum of its proper divisors (66881756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66716464 is a wasteful number, since it uses less digits than its factorization.

66716464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4409 (or 4372 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 66716464 is about 8168.0146914657. The cubic root of 66716464 is about 405.5810670579.

The spelling of 66716464 in words is "sixty-six million, seven hundred sixteen thousand, four hundred sixty-four".