866959780055 has 8 divisors (see below), whose sum is σ = 1040433994800. Its totient is φ = 693512984896.

The previous prime is 866959780051. The next prime is 866959780069. The reversal of 866959780055 is 550087959668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866959780055 - 2² = 866959780051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866959780051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6785270 + ... + 6911859.

It is an arithmetic number, because the mean of its divisors is an integer number (130054249350).

Almost surely, 2^866959780055 is an apocalyptic number.

866959780055 is a deficient number, since it is larger than the sum of its proper divisors (173474214745).

866959780055 is a wasteful number, since it uses less digits than its factorization.

866959780055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13709793.

The product of its (nonzero) digits is 163296000, while the sum is 68.

The spelling of 866959780055 in words is "eight hundred sixty-six billion, nine hundred fifty-nine million, seven hundred eighty thousand, fifty-five".