7798011866 has 4 divisors (see below), whose sum is σ = 11697017802. Its totient is φ = 3899005932.

The previous prime is 7798011853. The next prime is 7798011883. The reversal of 7798011866 is 6681108977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5270034025 + 2527977841 = 72595^2 + 50279^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1949502965 + ... + 1949502968.

Almost surely, 2^7798011866 is an apocalyptic number.

7798011866 is a deficient number, since it is larger than the sum of its proper divisors (3899005936).

7798011866 is a wasteful number, since it uses less digits than its factorization.

7798011866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899005935.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 7798011866 is about 88306.3523536104. The cubic root of 7798011866 is about 1983.0239703967.

The spelling of 7798011866 in words is "seven billion, seven hundred ninety-eight million, eleven thousand, eight hundred sixty-six".