2667921779 has 2 divisors, whose sum is σ = 2667921780. Its totient is φ = 2667921778.

The previous prime is 2667921733. The next prime is 2667921821. The reversal of 2667921779 is 9771297662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2667921779 - 2²⁰ = 2666873203 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2667921079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333960889 + 1333960890.

It is an arithmetic number, because the mean of its divisors is an integer number (1333960890).

Almost surely, 2^2667921779 is an apocalyptic number.

2667921779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2667921779 is an equidigital number, since it uses as much as digits as its factorization.

2667921779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 56.

The square root of 2667921779 is about 51651.9290927261. The cubic root of 2667921779 is about 1386.9400761489.

The spelling of 2667921779 in words is "two billion, six hundred sixty-seven million, nine hundred twenty-one thousand, seven hundred seventy-nine".