866788550128972 has 24 divisors (see below), whose sum is σ = 1596730383586800. Its totient is φ = 410580287199936.

The previous prime is 866788550128883. The next prime is 866788550128973. The reversal of 866788550128972 is 279821055887668.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (866788550128973) 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, 43905943 + ... + 60508750.

It is an arithmetic number, because the mean of its divisors is an integer number (66530432649450).

Almost surely, 2^{866788550128972} is an apocalyptic number.

It is an amenable number.

866788550128972 is a deficient number, since it is larger than the sum of its proper divisors (729941833457828).

866788550128972 is a wasteful number, since it uses less digits than its factorization.

866788550128972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104523945 (or 104523943 counting only the distinct ones).

The product of its (nonzero) digits is 6502809600, while the sum is 82.

The spelling of 866788550128972 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred fifty million, one hundred twenty-eight thousand, nine hundred seventy-two".