866864583650 has 24 divisors (see below), whose sum is σ = 1736396444244. Its totient is φ = 320073076800.

The previous prime is 866864583631. The next prime is 866864583659. The reversal of 866864583650 is 56385468668.

It can be written as a sum of positive squares in 6 ways, for example, as 462268089409 + 404596494241 = 679903^2 + 636079^2 .

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (866864583659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666818261 + ... + 666819560.

Almost surely, 2^866864583650 is an apocalyptic number.

866864583650 is an abundant number, since it is smaller than the sum of its proper divisors (869531860594).

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

866864583650 is a wasteful number, since it uses less digits than its factorization.

866864583650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333637846 (or 1333637841 counting only the distinct ones).

The product of its (nonzero) digits is 199065600, while the sum is 65.

The spelling of 866864583650 in words is "eight hundred sixty-six billion, eight hundred sixty-four million, five hundred eighty-three thousand, six hundred fifty".