866978133 has 16 divisors (see below), whose sum is σ = 1322711040. Its totient is φ = 494815536.

The previous prime is 866978033. The next prime is 866978137. The reversal of 866978133 is 331879668.

866978133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866978133 - 2⁸ = 866977877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866978137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6985 + ... + 42222.

It is an arithmetic number, because the mean of its divisors is an integer number (82669440).

Almost surely, 2^866978133 is an apocalyptic number.

It is an amenable number.

866978133 is a deficient number, since it is larger than the sum of its proper divisors (455732907).

866978133 is a wasteful number, since it uses less digits than its factorization.

866978133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50056.

The product of its digits is 1306368, while the sum is 51.

The square root of 866978133 is about 29444.4924052020. The cubic root of 866978133 is about 953.5337029596.

It can be divided in two parts, 86697 and 8133, that added together give a triangular number (94830 = T₄₃₅).

The spelling of 866978133 in words is "eight hundred sixty-six million, nine hundred seventy-eight thousand, one hundred thirty-three".