66985027237 has 2 divisors, whose sum is σ = 66985027238. Its totient is φ = 66985027236.

The previous prime is 66985027157. The next prime is 66985027253. The reversal of 66985027237 is 73272058966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49548088836 + 17436938401 = 222594^2 + 132049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66985027237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66985027297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33492513618 + 33492513619.

It is an arithmetic number, because the mean of its divisors is an integer number (33492513619).

Almost surely, 2^66985027237 is an apocalyptic number.

It is an amenable number.

66985027237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66985027237 is an equidigital number, since it uses as much as digits as its factorization.

66985027237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 66985027237 in words is "sixty-six billion, nine hundred eighty-five million, twenty-seven thousand, two hundred thirty-seven".