66800674097 has 2 divisors, whose sum is σ = 66800674098. Its totient is φ = 66800674096.

The previous prime is 66800674091. The next prime is 66800674121. The reversal of 66800674097 is 79047600866.

It is a happy number.

66800674097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64351512976 + 2449161121 = 253676^2 + 49489^2 .

It is a cyclic number.

It is not a de Polignac number, because 66800674097 - 2²⁰ = 66799625521 is a prime.

It is not a weakly prime, because it can be changed into another prime (66800674091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400337048 + 33400337049.

It is an arithmetic number, because the mean of its divisors is an integer number (33400337049).

Almost surely, 2^66800674097 is an apocalyptic number.

It is an amenable number.

66800674097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800674097 is an equidigital number, since it uses as much as digits as its factorization.

66800674097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 66800674097 in words is "sixty-six billion, eight hundred million, six hundred seventy-four thousand, ninety-seven".