8721856581278 has 16 divisors (see below), whose sum is σ = 13853400281424. Its totient is φ = 4104094999680.

The previous prime is 8721856581247. The next prime is 8721856581283.

8721856581278 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×8721856581278² (a number of 27 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9168125 + ... + 10074632.

It is an arithmetic number, because the mean of its divisors is an integer number (865837517589).

Almost surely, 2^{8721856581278} is an apocalyptic number.

8721856581278 is a deficient number, since it is larger than the sum of its proper divisors (5131543700146).

8721856581278 is a wasteful number, since it uses less digits than its factorization.

8721856581278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19256107.

The product of its digits is 120422400, while the sum is 68.

The spelling of 8721856581278 in words is "eight trillion, seven hundred twenty-one billion, eight hundred fifty-six million, five hundred eighty-one thousand, two hundred seventy-eight".