866788550274834 has 48 divisors (see below), whose sum is σ = 2067920347690080. Its totient is φ = 260208400812480.

The previous prime is 866788550274799. The next prime is 866788550274863. The reversal of 866788550274834 is 438472055887668.

866788550274834 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 8 + 5 + 502 + 74 + 8 + 34 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20456614099 + ... + 20456656470.

It is an arithmetic number, because the mean of its divisors is an integer number (43081673910210).

Almost surely, 2^{866788550274834} is an apocalyptic number.

866788550274834 is an abundant number, since it is smaller than the sum of its proper divisors (1201131797415246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866788550274834 is a wasteful number, since it uses less digits than its factorization.

866788550274834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40913270695 (or 40913270692 counting only the distinct ones).

The product of its (nonzero) digits is 17340825600, while the sum is 81.

The spelling of 866788550274834 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred fifty million, two hundred seventy-four thousand, eight hundred thirty-four".