66956222237 has 2 divisors, whose sum is σ = 66956222238. Its totient is φ = 66956222236.

The previous prime is 66956222197. The next prime is 66956222293. The reversal of 66956222237 is 73222265966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48107403556 + 18848818681 = 219334^2 + 137291^2 .

It is a cyclic number.

It is not a de Polignac number, because 66956222237 - 2¹² = 66956218141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66956212237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33478111118 + 33478111119.

It is an arithmetic number, because the mean of its divisors is an integer number (33478111119).

Almost surely, 2^66956222237 is an apocalyptic number.

It is an amenable number.

66956222237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66956222237 is an equidigital number, since it uses as much as digits as its factorization.

66956222237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 50.

The spelling of 66956222237 in words is "sixty-six billion, nine hundred fifty-six million, two hundred twenty-two thousand, two hundred thirty-seven".