866690090388 has 36 divisors (see below), whose sum is σ = 2190830634720. Its totient is φ = 288892650576.

The previous prime is 866690090377. The next prime is 866690090401. The reversal of 866690090388 is 883090096668.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 3578023 + ... + 3812561.

It is an arithmetic number, because the mean of its divisors is an integer number (60856406520).

Almost surely, 2^866690090388 is an apocalyptic number.

It is an amenable number.

866690090388 is an abundant number, since it is smaller than the sum of its proper divisors (1324140544332).

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

866690090388 is a wasteful number, since it uses less digits than its factorization.

866690090388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337196 (or 337191 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 63.

The spelling of 866690090388 in words is "eight hundred sixty-six billion, six hundred ninety million, ninety thousand, three hundred eighty-eight".