16506013563 has 24 divisors (see below), whose sum is σ = 25916003568. Its totient is φ = 10062608832.

The previous prime is 16506013547. The next prime is 16506013591. The reversal of 16506013563 is 36531060561.

16506013563 is a `hidden beast` number, since 16 + 5 + 0 + 601 + 35 + 6 + 3 = 666.

It is not a de Polignac number, because 16506013563 - 2⁴ = 16506013547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16506013523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 646720 + ... + 671757.

It is an arithmetic number, because the mean of its divisors is an integer number (1079833482).

Almost surely, 2^16506013563 is an apocalyptic number.

16506013563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16506013563 is a deficient number, since it is larger than the sum of its proper divisors (9409990005).

16506013563 is a wasteful number, since it uses less digits than its factorization.

16506013563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318603 (or 1318600 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 16506013563 in words is "sixteen billion, five hundred six million, thirteen thousand, five hundred sixty-three".