66784258837 has 2 divisors, whose sum is σ = 66784258838. Its totient is φ = 66784258836.

The previous prime is 66784258831. The next prime is 66784258841. The reversal of 66784258837 is 73885248766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36493989156 + 30290269681 = 191034^2 + 174041^2 .

It is a cyclic number.

It is not a de Polignac number, because 66784258837 - 2²⁷ = 66650041109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66784258831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33392129418 + 33392129419.

It is an arithmetic number, because the mean of its divisors is an integer number (33392129419).

Almost surely, 2^66784258837 is an apocalyptic number.

It is an amenable number.

66784258837 is a deficient number, since it is larger than the sum of its proper divisors (1).

66784258837 is an equidigital number, since it uses as much as digits as its factorization.

66784258837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108380160, while the sum is 64.

The spelling of 66784258837 in words is "sixty-six billion, seven hundred eighty-four million, two hundred fifty-eight thousand, eight hundred thirty-seven".