66537707 has 2 divisors, whose sum is σ = 66537708. Its totient is φ = 66537706.

The previous prime is 66537683. The next prime is 66537719. The reversal of 66537707 is 70773566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66537707 - 2¹⁰ = 66536683 is a prime.

It is not a weakly prime, because it can be changed into another prime (66537797) 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, 33268853 + 33268854.

It is an arithmetic number, because the mean of its divisors is an integer number (33268854).

Almost surely, 2^66537707 is an apocalyptic number.

66537707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66537707 is an equidigital number, since it uses as much as digits as its factorization.

66537707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 41.

The square root of 66537707 is about 8157.0648520163. The cubic root of 66537707 is about 405.2185113584.

The spelling of 66537707 in words is "sixty-six million, five hundred thirty-seven thousand, seven hundred seven".