1101778866 has 12 divisors (see below), whose sum is σ = 2387187582. Its totient is φ = 367259616.

The previous prime is 1101778837. The next prime is 1101778871. The reversal of 1101778866 is 6688771011.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 777238641 + 324540225 = 27879^2 + 18015^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 5 ways as a sum of consecutive naturals, for example, 30604951 + ... + 30604986.

Almost surely, 2^1101778866 is an apocalyptic number.

1101778866 is an abundant number, since it is smaller than the sum of its proper divisors (1285408716).

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

1101778866 is a wasteful number, since it uses less digits than its factorization.

1101778866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61209945 (or 61209942 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1101778866 is about 33193.0544843345. The cubic root of 1101778866 is about 1032.8362666796.

The spelling of 1101778866 in words is "one billion, one hundred one million, seven hundred seventy-eight thousand, eight hundred sixty-six".