66197359913 has 2 divisors, whose sum is σ = 66197359914. Its totient is φ = 66197359912.

The previous prime is 66197359883. The next prime is 66197359931. The reversal of 66197359913 is 31995379166.

It is a happy number.

Together with next prime (66197359931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57855643024 + 8341716889 = 240532^2 + 91333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66197359913 is a prime.

It is not a weakly prime, because it can be changed into another prime (66197359973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33098679956 + 33098679957.

It is an arithmetic number, because the mean of its divisors is an integer number (33098679957).

Almost surely, 2^66197359913 is an apocalyptic number.

It is an amenable number.

66197359913 is a deficient number, since it is larger than the sum of its proper divisors (1).

66197359913 is an equidigital number, since it uses as much as digits as its factorization.

66197359913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8266860, while the sum is 59.

The spelling of 66197359913 in words is "sixty-six billion, one hundred ninety-seven million, three hundred fifty-nine thousand, nine hundred thirteen".