866788807383738 has 48 divisors (see below), whose sum is σ = 1880363623297536. Its totient is φ = 288572581271520.

The previous prime is 866788807383679. The next prime is 866788807383749. The reversal of 866788807383738 is 837383708887668.

866788807383738 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 88 + 80 + 7 + 383 + 73 + 8 = 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, 115189320 + ... + 122483292.

It is an arithmetic number, because the mean of its divisors is an integer number (39174242152032).

Almost surely, 2^{866788807383738} is an apocalyptic number.

866788807383738 is an abundant number, since it is smaller than the sum of its proper divisors (1013574815913798).

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

866788807383738 is a wasteful number, since it uses less digits than its factorization.

866788807383738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7302139 (or 7302136 counting only the distinct ones).

The product of its (nonzero) digits is 87397761024, while the sum is 90.

The spelling of 866788807383738 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, eight hundred seven million, three hundred eighty-three thousand, seven hundred thirty-eight".