66372511 has 2 divisors, whose sum is σ = 66372512. Its totient is φ = 66372510.

The previous prime is 66372431. The next prime is 66372517. The reversal of 66372511 is 11527366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66372511 - 2¹¹ = 66370463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66372517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186255 + 33186256.

It is an arithmetic number, because the mean of its divisors is an integer number (33186256).

Almost surely, 2^66372511 is an apocalyptic number.

66372511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372511 is an equidigital number, since it uses as much as digits as its factorization.

66372511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 66372511 is about 8146.9326129532. The cubic root of 66372511 is about 404.8828823574.

Adding to 66372511 its reverse (11527366), we get a palindrome (77899877).

The spelling of 66372511 in words is "sixty-six million, three hundred seventy-two thousand, five hundred eleven".