866028646813 has 4 divisors (see below), whose sum is σ = 944758523808. Its totient is φ = 787298769820.

The previous prime is 866028646807. The next prime is 866028646849. The reversal of 866028646813 is 318646820668.

866028646813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866028646813 - 2²⁵ = 865995092381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866028646013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39364938481 + ... + 39364938502.

It is an arithmetic number, because the mean of its divisors is an integer number (236189630952).

Almost surely, 2^866028646813 is an apocalyptic number.

It is an amenable number.

866028646813 is a deficient number, since it is larger than the sum of its proper divisors (78729876995).

866028646813 is a wasteful number, since it uses less digits than its factorization.

866028646813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78729876994.

The product of its (nonzero) digits is 15925248, while the sum is 58.

The spelling of 866028646813 in words is "eight hundred sixty-six billion, twenty-eight million, six hundred forty-six thousand, eight hundred thirteen".