66888337 has 2 divisors, whose sum is σ = 66888338. Its totient is φ = 66888336.

The previous prime is 66888331. The next prime is 66888377. The reversal of 66888337 is 73388866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57395776 + 9492561 = 7576^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 66888337 - 2¹⁹ = 66364049 is a prime.

It is not a weakly prime, because it can be changed into another prime (66888331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444168 + 33444169.

It is an arithmetic number, because the mean of its divisors is an integer number (33444169).

Almost surely, 2^66888337 is an apocalyptic number.

It is an amenable number.

66888337 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888337 is an equidigital number, since it uses as much as digits as its factorization.

66888337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 66888337 is about 8178.5290242195. The cubic root of 66888337 is about 405.9290504282.

The spelling of 66888337 in words is "sixty-six million, eight hundred eighty-eight thousand, three hundred thirty-seven".