66964913 has 8 divisors (see below), whose sum is σ = 67858560. Its totient is φ = 66076560.

The previous prime is 66964907. The next prime is 66964927. The reversal of 66964913 is 31946966.

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

It is a cyclic number.

It is not a de Polignac number, because 66964913 - 2⁴ = 66964897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66964993) 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, 28406 + ... + 30672.

It is an arithmetic number, because the mean of its divisors is an integer number (8482320).

Almost surely, 2^66964913 is an apocalyptic number.

It is an amenable number.

66964913 is a deficient number, since it is larger than the sum of its proper divisors (893647).

66964913 is a wasteful number, since it uses less digits than its factorization.

66964913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647.

The product of its digits is 209952, while the sum is 44.

The square root of 66964913 is about 8183.2092115502. The cubic root of 66964913 is about 406.0838983919.

The spelling of 66964913 in words is "sixty-six million, nine hundred sixty-four thousand, nine hundred thirteen".