2666261360331 has 8 divisors (see below), whose sum is σ = 3950016830160. Its totient is φ = 1777507573536.

The previous prime is 2666261360327. The next prime is 2666261360351. The reversal of 2666261360331 is 1330631626662.

It is not a de Polignac number, because 2666261360331 - 2² = 2666261360327 is a prime.

It is a super-2 number, since 2×2666261360331² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2666261360351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49375210350 + ... + 49375210403.

It is an arithmetic number, because the mean of its divisors is an integer number (493752103770).

Almost surely, 2^{2666261360331} is an apocalyptic number.

2666261360331 is a deficient number, since it is larger than the sum of its proper divisors (1283755469829).

2666261360331 is an equidigital number, since it uses as much as digits as its factorization.

2666261360331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98750420762 (or 98750420756 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 45.

Adding to 2666261360331 its reverse (1330631626662), we get a palindrome (3996892986993).

The spelling of 2666261360331 in words is "two trillion, six hundred sixty-six billion, two hundred sixty-one million, three hundred sixty thousand, three hundred thirty-one".