66084749 has 2 divisors, whose sum is σ = 66084750. Its totient is φ = 66084748.

The previous prime is 66084709. The next prime is 66084751. The reversal of 66084749 is 94748066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 28015849 = 6170^2 + 5293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66084749 is a prime.

Together with 66084751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66084709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33042374 + 33042375.

It is an arithmetic number, because the mean of its divisors is an integer number (33042375).

Almost surely, 2^66084749 is an apocalyptic number.

It is an amenable number.

66084749 is a deficient number, since it is larger than the sum of its proper divisors (1).

66084749 is an equidigital number, since it uses as much as digits as its factorization.

66084749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66084749 is about 8129.2526716790. The cubic root of 66084749 is about 404.2969033552.

The spelling of 66084749 in words is "sixty-six million, eighty-four thousand, seven hundred forty-nine".