2661718968001 has 4 divisors (see below), whose sum is σ = 2661724787652. Its totient is φ = 2661713148352.

The previous prime is 2661718967911. The next prime is 2661718968047. The reversal of 2661718968001 is 1008698171662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2105978537601 + 555740430400 = 1451199^2 + 745480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661718968001 - 2¹⁷ = 2661718836929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661718968061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159236 + ... + 3160021.

It is an arithmetic number, because the mean of its divisors is an integer number (665431196913).

Almost surely, 2^{2661718968001} is an apocalyptic number.

It is an amenable number.

2661718968001 is a deficient number, since it is larger than the sum of its proper divisors (5819651).

2661718968001 is an equidigital number, since it uses as much as digits as its factorization.

2661718968001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819650.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 2661718968001 in words is "two trillion, six hundred sixty-one billion, seven hundred eighteen million, nine hundred sixty-eight thousand, one".