66244637 has 2 divisors, whose sum is σ = 66244638. Its totient is φ = 66244636.

The previous prime is 66244627. The next prime is 66244691. The reversal of 66244637 is 73644266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58813561 + 7431076 = 7669^2 + 2726^2 .

It is a cyclic number.

It is not a de Polignac number, because 66244637 - 2¹⁰ = 66243613 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66244637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66244627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33122318 + 33122319.

It is an arithmetic number, because the mean of its divisors is an integer number (33122319).

Almost surely, 2^66244637 is an apocalyptic number.

It is an amenable number.

66244637 is a deficient number, since it is larger than the sum of its proper divisors (1).

66244637 is an equidigital number, since it uses as much as digits as its factorization.

66244637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 38.

The square root of 66244637 is about 8139.0808449112. The cubic root of 66244637 is about 404.6226979427.

The spelling of 66244637 in words is "sixty-six million, two hundred forty-four thousand, six hundred thirty-seven".