66337254821 has 2 divisors, whose sum is σ = 66337254822. Its totient is φ = 66337254820.

The previous prime is 66337254799. The next prime is 66337254829. The reversal of 66337254821 is 12845273366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45235334596 + 21101920225 = 212686^2 + 145265^2 .

It is a cyclic number.

It is not a de Polignac number, because 66337254821 - 2²² = 66333060517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66337254829) 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, 33168627410 + 33168627411.

It is an arithmetic number, because the mean of its divisors is an integer number (33168627411).

Almost surely, 2^66337254821 is an apocalyptic number.

It is an amenable number.

66337254821 is a deficient number, since it is larger than the sum of its proper divisors (1).

66337254821 is an equidigital number, since it uses as much as digits as its factorization.

66337254821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 47.

The spelling of 66337254821 in words is "sixty-six billion, three hundred thirty-seven million, two hundred fifty-four thousand, eight hundred twenty-one".