66964491 has 12 divisors (see below), whose sum is σ = 105519960. Its totient is φ = 40584480.

The previous prime is 66964349. The next prime is 66964507. The reversal of 66964491 is 19446966.

It is not a de Polignac number, because 66964491 - 2⁹ = 66963979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66964091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338106 + ... + 338303.

It is an arithmetic number, because the mean of its divisors is an integer number (8793330).

Almost surely, 2^66964491 is an apocalyptic number.

66964491 is a deficient number, since it is larger than the sum of its proper divisors (38555469).

66964491 is a wasteful number, since it uses less digits than its factorization.

66964491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676426 (or 676423 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 66964491 is about 8183.1834270044. The cubic root of 66964491 is about 406.0830453692.

The spelling of 66964491 in words is "sixty-six million, nine hundred sixty-four thousand, four hundred ninety-one".