16517512481 has 4 divisors (see below), whose sum is σ = 16520509764. Its totient is φ = 16514515200.

The previous prime is 16517512469. The next prime is 16517512483. The reversal of 16517512481 is 18421571561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9804168256 + 6713344225 = 99016^2 + 81935^2 .

It is a cyclic number.

It is not a de Polignac number, because 16517512481 - 2¹⁴ = 16517496097 is a prime.

It is a super-2 number, since 2×16517512481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16517512483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490360 + ... + 1501401.

It is an arithmetic number, because the mean of its divisors is an integer number (4130127441).

Almost surely, 2^16517512481 is an apocalyptic number.

It is an amenable number.

16517512481 is a deficient number, since it is larger than the sum of its proper divisors (2997283).

16517512481 is an equidigital number, since it uses as much as digits as its factorization.

16517512481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997282.

The product of its digits is 67200, while the sum is 41.

The spelling of 16517512481 in words is "sixteen billion, five hundred seventeen million, five hundred twelve thousand, four hundred eighty-one".