8551558220681 has 16 divisors (see below), whose sum is σ = 9824179555200. Its totient is φ = 7291681993728.

The previous prime is 8551558220659. The next prime is 8551558220717. The reversal of 8551558220681 is 1860228551558.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8551558220681 - 2²⁶ = 8551491111817 is a prime.

It is a super-2 number, since 2×8551558220681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8551558220981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47883530 + ... + 48061788.

It is an arithmetic number, because the mean of its divisors is an integer number (614011222200).

Almost surely, 2^{8551558220681} is an apocalyptic number.

It is an amenable number.

8551558220681 is a deficient number, since it is larger than the sum of its proper divisors (1272621334519).

8551558220681 is a wasteful number, since it uses less digits than its factorization.

8551558220681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213968.

The product of its (nonzero) digits is 7680000, while the sum is 56.

The spelling of 8551558220681 in words is "eight trillion, five hundred fifty-one billion, five hundred fifty-eight million, two hundred twenty thousand, six hundred eighty-one".