866786278583400 has 384 divisors, whose sum is σ = 3089660199091200. Its totient is φ = 196913390284800.

The previous prime is 866786278583339. The next prime is 866786278583429. The reversal of 866786278583400 is 4385872687668.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1451427264 + ... + 1452024336.

It is an arithmetic number, because the mean of its divisors is an integer number (8045990101800).

Almost surely, 2^{866786278583400} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866786278583400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544830099545600).

866786278583400 is an abundant number, since it is smaller than the sum of its proper divisors (2222873920507800).

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

866786278583400 is a wasteful number, since it uses less digits than its factorization.

866786278583400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599209 (or 599200 counting only the distinct ones).

The product of its (nonzero) digits is 5202247680, while the sum is 78.

The spelling of 866786278583400 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, four hundred".