2643777778 has 16 divisors (see below), whose sum is σ = 4015186560. Its totient is φ = 1305462096.

The previous prime is 2643777769. The next prime is 2643777817. The reversal of 2643777778 is 8777773462.

It is an unprimeable number.

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, 47175 + ... + 86677.

It is an arithmetic number, because the mean of its divisors is an integer number (250949160).

Almost surely, 2^2643777778 is an apocalyptic number.

2643777778 is a deficient number, since it is larger than the sum of its proper divisors (1371408782).

2643777778 is a wasteful number, since it uses less digits than its factorization.

2643777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39921.

The product of its digits is 19361664, while the sum is 58.

The square root of 2643777778 is about 51417.6796248139. The cubic root of 2643777778 is about 1382.7435753548.

The spelling of 2643777778 in words is "two billion, six hundred forty-three million, seven hundred seventy-seven thousand, seven hundred seventy-eight".