636666488297141 has 2 divisors, whose sum is σ = 636666488297142. Its totient is φ = 636666488297140.

The previous prime is 636666488297113. The next prime is 636666488297153. The reversal of 636666488297141 is 141792884666636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 524156023958116 + 112510464339025 = 22894454^2 + 10607095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636666488297141 is a prime.

It is a super-2 number, since 2×636666488297141² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636666488297341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318333244148570 + 318333244148571.

It is an arithmetic number, because the mean of its divisors is an integer number (318333244148571).

Almost surely, 2^{636666488297141} is an apocalyptic number.

It is an amenable number.

636666488297141 is a deficient number, since it is larger than the sum of its proper divisors (1).

636666488297141 is an equidigital number, since it uses as much as digits as its factorization.

636666488297141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3009871872, while the sum is 77.

The spelling of 636666488297141 in words is "six hundred thirty-six trillion, six hundred sixty-six billion, four hundred eighty-eight million, two hundred ninety-seven thousand, one hundred forty-one".