16207581481 has 27 divisors (see below), whose sum is σ = 20430167031. Its totient is φ = 12814414704.

The previous prime is 16207581449. The next prime is 16207581497. The reversal of 16207581481 is 18418570261.

The square root of 16207581481 is 127309.

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., 2397571225 + 13810010256 = 48965^2 + 117516^2 .

It is not a de Polignac number, because 16207581481 - 2⁵ = 16207581449 is a prime.

It is a super-2 number, since 2×16207581481² (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 (16207581421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11584420 + ... + 11585818.

It is an arithmetic number, because the mean of its divisors is an integer number (756672853).

Almost surely, 2^16207581481 is an apocalyptic number.

16207581481 is the 127309-th square number.

16207581481 is the 63655-th centered octagonal number.

It is an amenable number.

16207581481 is a deficient number, since it is larger than the sum of its proper divisors (4222585550).

16207581481 is an frugal number, since it uses more digits than its factorization.

16207581481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 16207581481 in words is "sixteen billion, two hundred seven million, five hundred eighty-one thousand, four hundred eighty-one".