866155336872145 has 4 divisors (see below), whose sum is σ = 1039386404246580. Its totient is φ = 692924269497712.

The previous prime is 866155336872127. The next prime is 866155336872167. The reversal of 866155336872145 is 541278633551668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 304706908692736 + 561448428179409 = 17455856^2 + 23694903^2 .

It is a cyclic number.

It is not a de Polignac number, because 866155336872145 - 2¹³ = 866155336863953 is a prime.

It is a super-3 number, since 3×866155336872145³ (a number of 46 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86615533687210 + ... + 86615533687219.

It is an arithmetic number, because the mean of its divisors is an integer number (259846601061645).

Almost surely, 2^{866155336872145} is an apocalyptic number.

It is an amenable number.

866155336872145 is a deficient number, since it is larger than the sum of its proper divisors (173231067374435).

866155336872145 is a wasteful number, since it uses less digits than its factorization.

866155336872145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173231067374434.

The product of its digits is 870912000, while the sum is 70.

The spelling of 866155336872145 in words is "eight hundred sixty-six trillion, one hundred fifty-five billion, three hundred thirty-six million, eight hundred seventy-two thousand, one hundred forty-five".