2779981965 has 24 divisors (see below), whose sum is σ = 4997105568. Its totient is φ = 1482656400.

The previous prime is 2779981931. The next prime is 2779981973. The reversal of 2779981965 is 5691899772.

It is not a de Polignac number, because 2779981965 - 2⁷ = 2779981837 is a prime.

It is a super-2 number, since 2×2779981965² = 15456599451450522450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1142811 + ... + 1145240.

It is an arithmetic number, because the mean of its divisors is an integer number (208212732).

Almost surely, 2^2779981965 is an apocalyptic number.

It is an amenable number.

2779981965 is a deficient number, since it is larger than the sum of its proper divisors (2217123603).

2779981965 is an equidigital number, since it uses as much as digits as its factorization.

2779981965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288071 (or 2288059 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

The square root of 2779981965 is about 52725.5342789431. The cubic root of 2779981965 is about 1406.0928272339.

The spelling of 2779981965 in words is "two billion, seven hundred seventy-nine million, nine hundred eighty-one thousand, nine hundred sixty-five".