2661881567 has 2 divisors, whose sum is σ = 2661881568. Its totient is φ = 2661881566.

The previous prime is 2661881561. The next prime is 2661881587. The reversal of 2661881567 is 7651881662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661881567 - 2⁸ = 2661881311 is a prime.

It is a super-2 number, since 2×2661881567² = 14171226953468750978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661881561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330940783 + 1330940784.

It is an arithmetic number, because the mean of its divisors is an integer number (1330940784).

Almost surely, 2^2661881567 is an apocalyptic number.

2661881567 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661881567 is an equidigital number, since it uses as much as digits as its factorization.

2661881567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 2661881567 is about 51593.4256179990. The cubic root of 2661881567 is about 1385.8926013799.

The spelling of 2661881567 in words is "two billion, six hundred sixty-one million, eight hundred eighty-one thousand, five hundred sixty-seven".