866940812127 has 24 divisors (see below), whose sum is σ = 1395077174400. Its totient is φ = 515105414208.

The previous prime is 866940812117. The next prime is 866940812131. The reversal of 866940812127 is 721218049668.

It is a happy number.

It is not a de Polignac number, because 866940812127 - 2¹⁰ = 866940811103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866940812117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127750927 + ... + 127757712.

It is an arithmetic number, because the mean of its divisors is an integer number (58128215600).

Almost surely, 2^866940812127 is an apocalyptic number.

866940812127 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

866940812127 is a deficient number, since it is larger than the sum of its proper divisors (528136362273).

866940812127 is a wasteful number, since it uses less digits than its factorization.

866940812127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255508687 (or 255508684 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 866940812127 in words is "eight hundred sixty-six billion, nine hundred forty million, eight hundred twelve thousand, one hundred twenty-seven".