861494668 has 12 divisors (see below), whose sum is σ = 1512091672. Its totient is φ = 429468480.

The previous prime is 861494657. The next prime is 861494687. The reversal of 861494668 is 866494168.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318198 + ... + 320893.

Almost surely, 2^861494668 is an apocalyptic number.

It is an amenable number.

861494668 is a deficient number, since it is larger than the sum of its proper divisors (650597004).

861494668 is a wasteful number, since it uses less digits than its factorization.

861494668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639432 (or 639430 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 52.

The square root of 861494668 is about 29351.2294120706. The cubic root of 861494668 is about 951.5191457997.

The spelling of 861494668 in words is "eight hundred sixty-one million, four hundred ninety-four thousand, six hundred sixty-eight".