866770378656 has 384 divisors, whose sum is σ = 2834412134400. Its totient is φ = 225833287680.

The previous prime is 866770378627. The next prime is 866770378673. The reversal of 866770378656 is 656873077668.

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, 273513840 + ... + 273517008.

It is an arithmetic number, because the mean of its divisors is an integer number (7381281600).

Almost surely, 2^866770378656 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 866770378656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417206067200).

866770378656 is an abundant number, since it is smaller than the sum of its proper divisors (1967641755744).

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

866770378656 is a wasteful number, since it uses less digits than its factorization.

866770378656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 69.

The spelling of 866770378656 in words is "eight hundred sixty-six billion, seven hundred seventy million, three hundred seventy-eight thousand, six hundred fifty-six".