866504503922 has 6 divisors (see below), whose sum is σ = 1299758730543. Its totient is φ = 433251593742.

The previous prime is 866504503889. The next prime is 866504503951. The reversal of 866504503922 is 229305405668.

It can be written as a sum of positive squares in only one way, i.e., 433252251961 + 433252251961 = 658219^2 + 658219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=658219.

It is a super-2 number, since 2×866504503922² (a number of 25 digits) contains 22 as substring.

It is a Duffinian 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 2 ways as a sum of consecutive naturals, for example, 987329 + ... + 1645547.

Almost surely, 2^866504503922 is an apocalyptic number.

866504503922 is a deficient number, since it is larger than the sum of its proper divisors (433254226621).

866504503922 is an frugal number, since it uses more digits than its factorization.

866504503922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316440 (or 658221 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 50.

Multiplying 866504503922 by its sum of digits (50), we get a square (43325225196100 = 6582190²).

The spelling of 866504503922 in words is "eight hundred sixty-six billion, five hundred four million, five hundred three thousand, nine hundred twenty-two".