866786026508472 has 64 divisors (see below), whose sum is σ = 2476610112038400. Its totient is φ = 247645289658240.

The previous prime is 866786026508387. The next prime is 866786026508477. The reversal of 866786026508472 is 274805620687668.

It is a junction number, because it is equal to n+sod(n) for n = 866786026508394 and 866786026508403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786026508477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76573447 + ... + 87161142.

It is an arithmetic number, because the mean of its divisors is an integer number (38697033000600).

Almost surely, 2^{866786026508472} is an apocalyptic number.

It is an amenable number.

866786026508472 is an abundant number, since it is smaller than the sum of its proper divisors (1609824085529928).

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

866786026508472 is a wasteful number, since it uses less digits than its factorization.

866786026508472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163766116 (or 163766112 counting only the distinct ones).

The product of its (nonzero) digits is 2601123840, while the sum is 75.

The spelling of 866786026508472 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, twenty-six million, five hundred eight thousand, four hundred seventy-two".