16534885148721 has 27 divisors (see below), whose sum is σ = 23953013700889. Its totient is φ = 10991368754952.

The previous prime is 16534885148713. The next prime is 16534885148777. The reversal of 16534885148721 is 12784158843561.

The square root of 16534885148721 is 4066311.

It is a perfect power (a square), and thus also a powerful number.

16534885148721 is a `hidden beast` number, since 1 + 6 + 5 + 3 + 4 + 88 + 51 + 487 + 21 = 666.

16534885148721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16534885148721 - 2³ = 16534885148713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16534885148521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4672189570 + ... + 4672193108.

Almost surely, 2^{16534885148721} is an apocalyptic number.

16534885148721 is the 4066311-st square number.

16534885148721 is the 2033156-th centered octagonal number.

It is an amenable number.

16534885148721 is a deficient number, since it is larger than the sum of its proper divisors (7418128552168).

16534885148721 is an frugal number, since it uses more digits than its factorization.

16534885148721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7850 (or 3925 counting only the distinct ones).

The product of its digits is 51609600, while the sum is 63.

The spelling of 16534885148721 in words is "sixteen trillion, five hundred thirty-four billion, eight hundred eighty-five million, one hundred forty-eight thousand, seven hundred twenty-one".