551245366681 has 9 divisors (see below), whose sum is σ = 563259192799. Its totient is φ = 539482588744.

The previous prime is 551245366669. The next prime is 551245366717. The reversal of 551245366681 is 186663542155.

The square root of 551245366681 is 742459.

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

It can be written as a sum of positive squares in only one way, i.e., 401696102025 + 149549264656 = 633795^2 + 386716^2 .

It is not a de Polignac number, because 551245366681 - 2⁵ = 551245366649 is a prime.

It is a super-2 number, since 2×551245366681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551245366601) 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, 34887675 + ... + 34903471.

Almost surely, 2^551245366681 is an apocalyptic number.

551245366681 is the 742459-th square number.

551245366681 is the 371230-th centered octagonal number.

It is an amenable number.

551245366681 is a deficient number, since it is larger than the sum of its proper divisors (12013826118).

551245366681 is an frugal number, since it uses more digits than its factorization.

551245366681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31688 (or 15844 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 52.

The spelling of 551245366681 in words is "five hundred fifty-one billion, two hundred forty-five million, three hundred sixty-six thousand, six hundred eighty-one".