666261662030047 has 2 divisors, whose sum is σ = 666261662030048. Its totient is φ = 666261662030046.

The previous prime is 666261662029993. The next prime is 666261662030053. The reversal of 666261662030047 is 740030266162666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666261662030047 - 2²⁷ = 666261527812319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666261662030047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666261662030077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333130831015023 + 333130831015024.

It is an arithmetic number, because the mean of its divisors is an integer number (333130831015024).

Almost surely, 2^{666261662030047} is an apocalyptic number.

666261662030047 is a deficient number, since it is larger than the sum of its proper divisors (1).

666261662030047 is an equidigital number, since it uses as much as digits as its factorization.

666261662030047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 55.

The spelling of 666261662030047 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, six hundred sixty-two million, thirty thousand, forty-seven".