866514134063621 has 4 divisors (see below), whose sum is σ = 868741676825100. Its totient is φ = 864286591302144.

The previous prime is 866514134063603. The next prime is 866514134063659. The reversal of 866514134063621 is 126360431415668.

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 560218247344900 + 306295886718721 = 23668930^2 + 17501311^2 .

It is a cyclic number.

It is not a de Polignac number, because 866514134063621 - 2⁴⁶ = 796145389885957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866514134063671) 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, 1113771380156 + ... + 1113771380933.

It is an arithmetic number, because the mean of its divisors is an integer number (217185419206275).

Almost surely, 2^{866514134063621} is an apocalyptic number.

It is an amenable number.

866514134063621 is a deficient number, since it is larger than the sum of its proper divisors (2227542761479).

866514134063621 is a wasteful number, since it uses less digits than its factorization.

866514134063621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227542761478.

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 866514134063621 in words is "eight hundred sixty-six trillion, five hundred fourteen billion, one hundred thirty-four million, sixty-three thousand, six hundred twenty-one".