2649018778 has 16 divisors (see below), whose sum is σ = 4808303424. Its totient is φ = 1068511680.

The previous prime is 2649018773. The next prime is 2649018781. The reversal of 2649018778 is 8778109462.

It is a super-2 number, since 2×2649018778² = 14034600972393226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2649018773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5564928 + ... + 5565403.

It is an arithmetic number, because the mean of its divisors is an integer number (300518964).

Almost surely, 2^2649018778 is an apocalyptic number.

2649018778 is a deficient number, since it is larger than the sum of its proper divisors (2159284646).

2649018778 is a wasteful number, since it uses less digits than its factorization.

2649018778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130357.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The square root of 2649018778 is about 51468.6193519896. The cubic root of 2649018778 is about 1383.6566848249.

The spelling of 2649018778 in words is "two billion, six hundred forty-nine million, eighteen thousand, seven hundred seventy-eight".