66964837 has 2 divisors, whose sum is σ = 66964838. Its totient is φ = 66964836.

The previous prime is 66964813. The next prime is 66964841. The reversal of 66964837 is 73846966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60000516 + 6964321 = 7746^2 + 2639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66964837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66964897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33482418 + 33482419.

It is an arithmetic number, because the mean of its divisors is an integer number (33482419).

Almost surely, 2^66964837 is an apocalyptic number.

It is an amenable number.

66964837 is a deficient number, since it is larger than the sum of its proper divisors (1).

66964837 is an equidigital number, since it uses as much as digits as its factorization.

66964837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 66964837 is about 8183.2045678939. The cubic root of 66964837 is about 406.0837447672.

The spelling of 66964837 in words is "sixty-six million, nine hundred sixty-four thousand, eight hundred thirty-seven".