866197264427 has 16 divisors (see below), whose sum is σ = 975611879424. Its totient is φ = 762196680000.

The previous prime is 866197264417. The next prime is 866197264469. The reversal of 866197264427 is 724462791668.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 866197264427 - 2¹⁴ = 866197248043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866197264427.

It is not an unprimeable number, because it can be changed into a prime (866197264417) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7504199 + ... + 7618752.

It is an arithmetic number, because the mean of its divisors is an integer number (60975742464).

Almost surely, 2^866197264427 is an apocalyptic number.

866197264427 is a deficient number, since it is larger than the sum of its proper divisors (109414614997).

866197264427 is a wasteful number, since it uses less digits than its factorization.

866197264427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15123130.

The product of its digits is 48771072, while the sum is 62.

The spelling of 866197264427 in words is "eight hundred sixty-six billion, one hundred ninety-seven million, two hundred sixty-four thousand, four hundred twenty-seven".