2661277139 has 2 divisors, whose sum is σ = 2661277140. Its totient is φ = 2661277138.

The previous prime is 2661277109. The next prime is 2661277141. The reversal of 2661277139 is 9317721662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661277139 - 2²⁰ = 2660228563 is a prime.

Together with 2661277141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661277139.

It is not a weakly prime, because it can be changed into another prime (2661277109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330638569 + 1330638570.

It is an arithmetic number, because the mean of its divisors is an integer number (1330638570).

Almost surely, 2^2661277139 is an apocalyptic number.

2661277139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661277139 is an equidigital number, since it uses as much as digits as its factorization.

2661277139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 2661277139 is about 51587.5676786568. The cubic root of 2661277139 is about 1385.7876961736.

The spelling of 2661277139 in words is "two billion, six hundred sixty-one million, two hundred seventy-seven thousand, one hundred thirty-nine".