16531517428287 has 8 divisors (see below), whose sum is σ = 22042197833904. Its totient is φ = 11020924320768.

The previous prime is 16531517428133. The next prime is 16531517428289. The reversal of 16531517428287 is 78282471513561.

16531517428287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-16531517428287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16531517428287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531517428289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21381378 + ... + 22141055.

It is an arithmetic number, because the mean of its divisors is an integer number (2755274729238).

Almost surely, 2^{16531517428287} is an apocalyptic number.

16531517428287 is a deficient number, since it is larger than the sum of its proper divisors (5510680405617).

16531517428287 is a wasteful number, since it uses less digits than its factorization.

16531517428287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43649049.

The product of its digits is 22579200, while the sum is 60.

The spelling of 16531517428287 in words is "sixteen trillion, five hundred thirty-one billion, five hundred seventeen million, four hundred twenty-eight thousand, two hundred eighty-seven".