866788524522161 has 4 divisors (see below), whose sum is σ = 869611939911792. Its totient is φ = 863965109132532.

The previous prime is 866788524522103. The next prime is 866788524522293. The reversal of 866788524522161 is 161225425887668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866788524522161 - 2⁶ = 866788524522097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866788524552161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411707694355 + ... + 1411707694968.

It is an arithmetic number, because the mean of its divisors is an integer number (217402984977948).

Almost surely, 2^{866788524522161} is an apocalyptic number.

It is an amenable number.

866788524522161 is a deficient number, since it is larger than the sum of its proper divisors (2823415389631).

866788524522161 is a wasteful number, since it uses less digits than its factorization.

866788524522161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823415389630.

The product of its digits is 619315200, while the sum is 71.

The spelling of 866788524522161 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, five hundred twenty-two thousand, one hundred sixty-one".