2667779649 has 12 divisors (see below), whose sum is σ = 3853931796. Its totient is φ = 1778301792.

The previous prime is 2667779633. The next prime is 2667779657. The reversal of 2667779649 is 9469777662.

It can be written as a sum of positive squares in 2 ways, for example, as 1795640625 + 872139024 = 42375^2 + 29532^2 .

It is not a de Polignac number, because 2667779649 - 2⁴ = 2667779633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2667771649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99379 + ... + 123335.

It is an arithmetic number, because the mean of its divisors is an integer number (321160983).

Almost surely, 2^2667779649 is an apocalyptic number.

It is an amenable number.

2667779649 is a deficient number, since it is larger than the sum of its proper divisors (1186152147).

2667779649 is a wasteful number, since it uses less digits than its factorization.

2667779649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36336 (or 36333 counting only the distinct ones).

The product of its digits is 48009024, while the sum is 63.

The square root of 2667779649 is about 51650.5532303382. The cubic root of 2667779649 is about 1386.9154465795.

The spelling of 2667779649 in words is "two billion, six hundred sixty-seven million, seven hundred seventy-nine thousand, six hundred forty-nine".