866844290025 has 96 divisors (see below), whose sum is σ = 1899041310720. Its totient is φ = 379042424640.

The previous prime is 866844290017. The next prime is 866844290069. The reversal of 866844290025 is 520092448668.

It is not a de Polignac number, because 866844290025 - 2³ = 866844290017 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3879567 + ... + 4096916.

It is an arithmetic number, because the mean of its divisors is an integer number (19781680320).

Almost surely, 2^866844290025 is an apocalyptic number.

It is an amenable number.

866844290025 is an abundant number, since it is smaller than the sum of its proper divisors (1032197020695).

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

866844290025 is a wasteful number, since it uses less digits than its factorization.

866844290025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7976532 (or 7976521 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 866844290025 in words is "eight hundred sixty-six billion, eight hundred forty-four million, two hundred ninety thousand, twenty-five".