866788550128886 has 128 divisors (see below), whose sum is σ = 1646891329314816. Its totient is φ = 332365194420480.

The previous prime is 866788550128883. The next prime is 866788550128973. The reversal of 866788550128886 is 688821055887668.

It is a junction number, because it is equal to n+sod(n) for n = 866788550128798 and 866788550128807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866788550128883) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1700587871 + ... + 1701097493.

It is an arithmetic number, because the mean of its divisors is an integer number (12866338510272).

Almost surely, 2^{866788550128886} is an apocalyptic number.

866788550128886 is a deficient number, since it is larger than the sum of its proper divisors (780102779185930).

866788550128886 is a wasteful number, since it uses less digits than its factorization.

866788550128886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510426.

The product of its (nonzero) digits is 19818086400, while the sum is 86.

The spelling of 866788550128886 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred fifty million, one hundred twenty-eight thousand, eight hundred eighty-six".