66015853 has 2 divisors, whose sum is σ = 66015854. Its totient is φ = 66015852.

The previous prime is 66015827. The next prime is 66015857. The reversal of 66015853 is 35851066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65237929 + 777924 = 8077^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 66015853 - 2⁵ = 66015821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66015857) 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, 33007926 + 33007927.

It is an arithmetic number, because the mean of its divisors is an integer number (33007927).

Almost surely, 2^66015853 is an apocalyptic number.

It is an amenable number.

66015853 is a deficient number, since it is larger than the sum of its proper divisors (1).

66015853 is an equidigital number, since it uses as much as digits as its factorization.

66015853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 66015853 is about 8125.0140307571. The cubic root of 66015853 is about 404.1563559255.

The spelling of 66015853 in words is "sixty-six million, fifteen thousand, eight hundred fifty-three".