1918775778 has 16 divisors (see below), whose sum is σ = 3969881280. Its totient is φ = 617536976.

The previous prime is 1918775693. The next prime is 1918775797. The reversal of 1918775778 is 8775778191.

1918775778 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5513550 + ... + 5513897.

It is an arithmetic number, because the mean of its divisors is an integer number (248117580).

Almost surely, 2^1918775778 is an apocalyptic number.

1918775778 is an abundant number, since it is smaller than the sum of its proper divisors (2051105502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918775778 is a wasteful number, since it uses less digits than its factorization.

1918775778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11027481.

The product of its digits is 6914880, while the sum is 60.

The square root of 1918775778 is about 43803.8329144836. The cubic root of 1918775778 is about 1242.6287835507.

The spelling of 1918775778 in words is "one billion, nine hundred eighteen million, seven hundred seventy-five thousand, seven hundred seventy-eight".