8550015769681 has 9 divisors (see below), whose sum is σ = 8855098209841. Its totient is φ = 8255105766544.

The previous prime is 8550015769657. The next prime is 8550015769723. The reversal of 8550015769681 is 1869675100558.

The square root of 8550015769681 is 2924041.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2483646769681 + 6066369000000 = 1575959^2 + 2463000^2 .

It is not a de Polignac number, because 8550015769681 - 2¹¹ = 8550015767633 is a prime.

It is a super-2 number, since 2×8550015769681² (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 (8550015769651) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 84746775 + ... + 84847603.

Almost surely, 2^{8550015769681} is an apocalyptic number.

8550015769681 is the 2924041-st square number.

8550015769681 is the 1462021-st centered octagonal number.

It is an amenable number.

8550015769681 is a deficient number, since it is larger than the sum of its proper divisors (305082440160).

8550015769681 is an frugal number, since it uses more digits than its factorization.

8550015769681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201716 (or 100858 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 61.

The spelling of 8550015769681 in words is "eight trillion, five hundred fifty billion, fifteen million, seven hundred sixty-nine thousand, six hundred eighty-one".