2687205779 has 2 divisors, whose sum is σ = 2687205780. Its totient is φ = 2687205778.

The previous prime is 2687205761. The next prime is 2687205791. The reversal of 2687205779 is 9775027862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2687205779 - 2²⁰ = 2686157203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2687205779.

It is not a weakly prime, because it can be changed into another prime (2687205709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343602889 + 1343602890.

It is an arithmetic number, because the mean of its divisors is an integer number (1343602890).

Almost surely, 2^2687205779 is an apocalyptic number.

2687205779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687205779 is an equidigital number, since it uses as much as digits as its factorization.

2687205779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The square root of 2687205779 is about 51838.2655863408. The cubic root of 2687205779 is about 1390.2737033263.

The spelling of 2687205779 in words is "two billion, six hundred eighty-seven million, two hundred five thousand, seven hundred seventy-nine".