866786274634445 has 64 divisors (see below), whose sum is σ = 1219930330374144. Its totient is φ = 584929765432320.

The previous prime is 866786274634349. The next prime is 866786274634451. The reversal of 866786274634445 is 544436472687668.

It is not a de Polignac number, because 866786274634445 - 2²⁴ = 866786257857229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866786274634445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57789827 + ... + 71226656.

It is an arithmetic number, because the mean of its divisors is an integer number (19061411412096).

Almost surely, 2^{866786274634445} is an apocalyptic number.

It is an amenable number.

866786274634445 is a deficient number, since it is larger than the sum of its proper divisors (353144055739699).

866786274634445 is a wasteful number, since it uses less digits than its factorization.

866786274634445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129016682.

The product of its digits is 31213486080, while the sum is 80.

The spelling of 866786274634445 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, six hundred thirty-four thousand, four hundred forty-five".