66335761 has 2 divisors, whose sum is σ = 66335762. Its totient is φ = 66335760.

The previous prime is 66335743. The next prime is 66335771. The reversal of 66335761 is 16753366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 11025 = 8144^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 66335761 - 2¹⁵ = 66302993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66335761.

It is not a weakly prime, because it can be changed into another prime (66335741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33167880 + 33167881.

It is an arithmetic number, because the mean of its divisors is an integer number (33167881).

Almost surely, 2^66335761 is an apocalyptic number.

It is an amenable number.

66335761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66335761 is an equidigital number, since it uses as much as digits as its factorization.

66335761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 66335761 is about 8144.6768505571. The cubic root of 66335761 is about 404.8081416112.

The spelling of 66335761 in words is "sixty-six million, three hundred thirty-five thousand, seven hundred sixty-one".