866788524506138 has 16 divisors (see below), whose sum is σ = 1400198307398856. Its totient is φ = 400055824902720.

The previous prime is 866788524506081. The next prime is 866788524506159. The reversal of 866788524506138 is 831605425887668.

It can be written as a sum of positive squares in 4 ways, for example, as 824064692401729 + 42723832104409 = 28706527^2 + 6536347^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8772620 + ... + 42550392.

Almost surely, 2^{866788524506138} is an apocalyptic number.

866788524506138 is a deficient number, since it is larger than the sum of its proper divisors (533409782892718).

866788524506138 is a wasteful number, since it uses less digits than its factorization.

866788524506138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34764769.

The product of its (nonzero) digits is 3715891200, while the sum is 77.

The spelling of 866788524506138 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, five hundred six thousand, one hundred thirty-eight".