16247285581 has 4 divisors (see below), whose sum is σ = 16258656700. Its totient is φ = 16235914464.

The previous prime is 16247285557. The next prime is 16247285591. The reversal of 16247285581 is 18558274261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18558274261 = 74959 ⋅247579.

It can be written as a sum of positive squares in 2 ways, for example, as 8890792681 + 7356492900 = 94291^2 + 85770^2 .

It is a cyclic number.

It is not a de Polignac number, because 16247285581 - 2⁹ = 16247285069 is a prime.

It is a super-3 number, since 3×16247285581³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16247285591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5683416 + ... + 5686273.

It is an arithmetic number, because the mean of its divisors is an integer number (4064664175).

Almost surely, 2^16247285581 is an apocalyptic number.

It is an amenable number.

16247285581 is a deficient number, since it is larger than the sum of its proper divisors (11371119).

16247285581 is a wasteful number, since it uses less digits than its factorization.

16247285581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11371118.

The product of its digits is 1075200, while the sum is 49.

The spelling of 16247285581 in words is "sixteen billion, two hundred forty-seven million, two hundred eighty-five thousand, five hundred eighty-one".