66431075614693 has 2 divisors, whose sum is σ = 66431075614694. Its totient is φ = 66431075614692.

The previous prime is 66431075614661. The next prime is 66431075614699. The reversal of 66431075614693 is 39641657013466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54167863053924 + 12263212560769 = 7359882^2 + 3501887^2 .

It is a cyclic number.

It is not a de Polignac number, because 66431075614693 - 2⁵ = 66431075614661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66431075614699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33215537807346 + 33215537807347.

It is an arithmetic number, because the mean of its divisors is an integer number (33215537807347).

Almost surely, 2^{66431075614693} is an apocalyptic number.

It is an amenable number.

66431075614693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66431075614693 is an equidigital number, since it uses as much as digits as its factorization.

66431075614693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58786560, while the sum is 61.

The spelling of 66431075614693 in words is "sixty-six trillion, four hundred thirty-one billion, seventy-five million, six hundred fourteen thousand, six hundred ninety-three".