866972509056 has 64 divisors (see below), whose sum is σ = 2558773040400. Its totient is φ = 288990835200.

The previous prime is 866972509049. The next prime is 866972509103. The reversal of 866972509056 is 650905279668.

866972509056 is a `hidden beast` number, since 8 + 6 + 6 + 9 + 72 + 509 + 0 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×866972509056² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866972508984 and 866972509002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125426595 + ... + 125433506.

Almost surely, 2^866972509056 is an apocalyptic number.

It is an amenable number.

866972509056 is an abundant number, since it is smaller than the sum of its proper divisors (1691800531344).

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

866972509056 is a wasteful number, since it uses less digits than its factorization.

866972509056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250860124 (or 250860106 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 866972509056 in words is "eight hundred sixty-six billion, nine hundred seventy-two million, five hundred nine thousand, fifty-six".