13066547481 has 45 divisors (see below), whose sum is σ = 21157791501. Its totient is φ = 8032722048.

The previous prime is 13066547479. The next prime is 13066547537. The reversal of 13066547481 is 18474566031.

The square root of 13066547481 is 114309.

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

13066547481 is a `hidden beast` number, since 1 + 3 + 0 + 66 + 547 + 48 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 247779081 + 12818768400 = 15741^2 + 113220^2 .

It is not a de Polignac number, because 13066547481 - 2¹ = 13066547479 is a prime.

It is a super-2 number, since 2×13066547481² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13066547981) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 13373665 + ... + 13374641.

Almost surely, 2^13066547481 is an apocalyptic number.

13066547481 is the 114309-th square number.

13066547481 is the 57155-th centered octagonal number.

It is an amenable number.

13066547481 is a deficient number, since it is larger than the sum of its proper divisors (8091244020).

13066547481 is an frugal number, since it uses more digits than its factorization.

13066547481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 13066547481 in words is "thirteen billion, sixty-six million, five hundred forty-seven thousand, four hundred eighty-one".