866628622421 has 16 divisors (see below), whose sum is σ = 927882278400. Its totient is φ = 806944528368.

The previous prime is 866628622397. The next prime is 866628622441. The reversal of 866628622421 is 124226826668.

866628622421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 866628622421 - 2⁶ = 866628622357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866628622441) 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, 5921696 + ... + 6066278.

It is an arithmetic number, because the mean of its divisors is an integer number (57992642400).

Almost surely, 2^866628622421 is an apocalyptic number.

It is an amenable number.

866628622421 is a deficient number, since it is larger than the sum of its proper divisors (61253655979).

866628622421 is a wasteful number, since it uses less digits than its factorization.

866628622421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150008.

The product of its digits is 5308416, while the sum is 53.

The spelling of 866628622421 in words is "eight hundred sixty-six billion, six hundred twenty-eight million, six hundred twenty-two thousand, four hundred twenty-one".