666140067263761 has 2 divisors, whose sum is σ = 666140067263762. Its totient is φ = 666140067263760.

The previous prime is 666140067263719. The next prime is 666140067263779. The reversal of 666140067263761 is 167362760041666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 589521119363136 + 76618947900625 = 24280056^2 + 8753225^2 .

It is a cyclic number.

It is not a de Polignac number, because 666140067263761 - 2¹³ = 666140067255569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666140067263761.

It is not a weakly prime, because it can be changed into another prime (666140067260761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070033631880 + 333070033631881.

It is an arithmetic number, because the mean of its divisors is an integer number (333070033631881).

Almost surely, 2^{666140067263761} is an apocalyptic number.

It is an amenable number.

666140067263761 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140067263761 is an equidigital number, since it uses as much as digits as its factorization.

666140067263761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54867456, while the sum is 61.

The spelling of 666140067263761 in words is "six hundred sixty-six trillion, one hundred forty billion, sixty-seven million, two hundred sixty-three thousand, seven hundred sixty-one".