13558506481 has 21 divisors (see below), whose sum is σ = 14970750109. Its totient is φ = 12279402096.

The previous prime is 13558506469. The next prime is 13558506491. The reversal of 13558506481 is 18460585531.

The square root of 13558506481 is 116441.

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

It can be written as a sum of positive squares in 10 ways, for example, as 4677328881 + 8881177600 = 68391^2 + 94240^2 .

It is not a de Polignac number, because 13558506481 - 2²³ = 13550117873 is a prime.

It is a super-2 number, since 2×13558506481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13558506421) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 255820851 + ... + 255820903.

Almost surely, 2^13558506481 is an apocalyptic number.

13558506481 is the 116441-st square number.

13558506481 is the 58221-st centered octagonal number.

It is an amenable number.

13558506481 is a deficient number, since it is larger than the sum of its proper divisors (1412243628).

13558506481 is an frugal number, since it uses more digits than its factorization.

13558506481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 46.

The spelling of 13558506481 in words is "thirteen billion, five hundred fifty-eight million, five hundred six thousand, four hundred eighty-one".