79866855866897 has 12 divisors (see below), whose sum is σ = 87788112991488. Its totient is φ = 72605755219800.

The previous prime is 79866855866873. The next prime is 79866855866909.

79866855866897 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 79866855866897 - 2¹⁰ = 79866855865873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79866855826897) 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 11 ways as a sum of consecutive naturals, for example, 17006528 + ... + 21188574.

It is an arithmetic number, because the mean of its divisors is an integer number (7315676082624).

Almost surely, 2^{79866855866897} is an apocalyptic number.

It is an amenable number.

79866855866897 is a deficient number, since it is larger than the sum of its proper divisors (7921257124591).

79866855866897 is a wasteful number, since it uses less digits than its factorization.

79866855866897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4339900 (or 4339889 counting only the distinct ones).

The product of its digits is 526727577600, while the sum is 98.

The spelling of 79866855866897 in words is "seventy-nine trillion, eight hundred sixty-six billion, eight hundred fifty-five million, eight hundred sixty-six thousand, eight hundred ninety-seven".