866788550128887 has 8 divisors (see below), whose sum is σ = 1186953690266736. Its totient is φ = 562241221705152.

The previous prime is 866788550128883. The next prime is 866788550128973. The reversal of 866788550128887 is 788821055887668.

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

It is not a de Polignac number, because 866788550128887 - 2² = 866788550128883 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 3904452928398 + ... + 3904452928619.

It is an arithmetic number, because the mean of its divisors is an integer number (148369211283342).

Almost surely, 2^{866788550128887} is an apocalyptic number.

866788550128887 is a deficient number, since it is larger than the sum of its proper divisors (320165140137849).

866788550128887 is a wasteful number, since it uses less digits than its factorization.

866788550128887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808905857057.

The product of its (nonzero) digits is 23121100800, while the sum is 87.

The spelling of 866788550128887 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-seven".