866421429839 has 16 divisors (see below), whose sum is σ = 990908006400. Its totient is φ = 742113097344.

The previous prime is 866421429799. The next prime is 866421429851. The reversal of 866421429839 is 938924124668.

It is a cyclic number.

It is not a de Polignac number, because 866421429839 - 2²⁴ = 866404652623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866421429859) 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, 72443342 + ... + 72455300.

It is an arithmetic number, because the mean of its divisors is an integer number (61931750400).

Almost surely, 2^866421429839 is an apocalyptic number.

866421429839 is a deficient number, since it is larger than the sum of its proper divisors (124486576561).

866421429839 is a wasteful number, since it uses less digits than its factorization.

866421429839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18542.

The product of its digits is 35831808, while the sum is 62.

The spelling of 866421429839 in words is "eight hundred sixty-six billion, four hundred twenty-one million, four hundred twenty-nine thousand, eight hundred thirty-nine".