981977866 has 8 divisors (see below), whose sum is σ = 1479130560. Its totient is φ = 488934348.

The previous prime is 981977837. The next prime is 981977873. The reversal of 981977866 is 668779189.

981977866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1026696 + ... + 1027651.

It is an arithmetic number, because the mean of its divisors is an integer number (184891320).

Almost surely, 2^981977866 is an apocalyptic number.

981977866 is a deficient number, since it is larger than the sum of its proper divisors (497152694).

981977866 is a wasteful number, since it uses less digits than its factorization.

981977866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054588.

The product of its digits is 9144576, while the sum is 61.

The square root of 981977866 is about 31336.5260678334. The cubic root of 981977866 is about 993.9561676804.

The spelling of 981977866 in words is "nine hundred eighty-one million, nine hundred seventy-seven thousand, eight hundred sixty-six".