866511246616401 has 16 divisors (see below), whose sum is σ = 1185285560671296. Its totient is φ = 562896231492096.

The previous prime is 866511246616391. The next prime is 866511246616429. The reversal of 866511246616401 is 104616642115668.

It is not a de Polignac number, because 866511246616401 - 2³⁴ = 866494066747217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866511246616801) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 23835357480 + ... + 23835393833.

It is an arithmetic number, because the mean of its divisors is an integer number (74080347541956).

Almost surely, 2^{866511246616401} is an apocalyptic number.

It is an amenable number.

866511246616401 is a deficient number, since it is larger than the sum of its proper divisors (318774314054895).

866511246616401 is a wasteful number, since it uses less digits than its factorization.

866511246616401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47670751472.

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 866511246616401 in words is "eight hundred sixty-six trillion, five hundred eleven billion, two hundred forty-six million, six hundred sixteen thousand, four hundred one".