866788807382421 has 16 divisors (see below), whose sum is σ = 1440895679804928. Its totient is φ = 450279899938800.

The previous prime is 866788807382371. The next prime is 866788807382429. The reversal of 866788807382421 is 124283708887668.

It is not a de Polignac number, because 866788807382421 - 2⁴³ = 857992714360213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866788807382429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1876166249515 + ... + 1876166249976.

It is an arithmetic number, because the mean of its divisors is an integer number (90055979987808).

Almost surely, 2^{866788807382421} is an apocalyptic number.

It is an amenable number.

866788807382421 is a deficient number, since it is larger than the sum of its proper divisors (574106872422507).

866788807382421 is a wasteful number, since it uses less digits than its factorization.

866788807382421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752332499512.

The product of its (nonzero) digits is 2774532096, while the sum is 78.

The spelling of 866788807382421 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, eight hundred seven million, three hundred eighty-two thousand, four hundred twenty-one".