2661718967911 has 2 divisors, whose sum is σ = 2661718967912. Its totient is φ = 2661718967910.

The previous prime is 2661718967909. The next prime is 2661718968047. The reversal of 2661718967911 is 1197698171662.

It is a happy number.

2661718967911 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661718967911 - 2¹ = 2661718967909 is a prime.

Together with 2661718967909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661718965911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330859483955 + 1330859483956.

It is an arithmetic number, because the mean of its divisors is an integer number (1330859483956).

Almost surely, 2^{2661718967911} is an apocalyptic number.

2661718967911 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661718967911 is an equidigital number, since it uses as much as digits as its factorization.

2661718967911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 64.

The spelling of 2661718967911 in words is "two trillion, six hundred sixty-one billion, seven hundred eighteen million, nine hundred sixty-seven thousand, nine hundred eleven".