866359831554 has 96 divisors (see below), whose sum is σ = 2187233553024. Its totient is φ = 242728876800.

The previous prime is 866359831543. The next prime is 866359831621. The reversal of 866359831554 is 455138953668.

It is a happy number.

866359831554 is a `hidden beast` number, since 8 + 6 + 6 + 3 + 598 + 31 + 5 + 5 + 4 = 666.

It is a super-3 number, since 3×866359831554³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 866359831491 and 866359831500.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1319029 + ... + 1863479.

It is an arithmetic number, because the mean of its divisors is an integer number (22783682844).

Almost surely, 2^866359831554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866359831554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093616776512).

866359831554 is an abundant number, since it is smaller than the sum of its proper divisors (1320873721470).

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

866359831554 is a wasteful number, since it uses less digits than its factorization.

866359831554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544712 (or 544709 counting only the distinct ones).

The product of its digits is 93312000, while the sum is 63.

The spelling of 866359831554 in words is "eight hundred sixty-six billion, three hundred fifty-nine million, eight hundred thirty-one thousand, five hundred fifty-four".