66013237 has 2 divisors, whose sum is σ = 66013238. Its totient is φ = 66013236.

The previous prime is 66013219. The next prime is 66013273. The reversal of 66013237 is 73231066.

Together with next prime (66013273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42915601 + 23097636 = 6551^2 + 4806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66013237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66013537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33006618 + 33006619.

It is an arithmetic number, because the mean of its divisors is an integer number (33006619).

Almost surely, 2^66013237 is an apocalyptic number.

It is an amenable number.

66013237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66013237 is an equidigital number, since it uses as much as digits as its factorization.

66013237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 66013237 is about 8124.8530448249. The cubic root of 66013237 is about 404.1510173745.

The spelling of 66013237 in words is "sixty-six million, thirteen thousand, two hundred thirty-seven".