16551621216 has 96 divisors (see below), whose sum is σ = 51989101920. Its totient is φ = 5092803072.

The previous prime is 16551621173. The next prime is 16551621253. The reversal of 16551621216 is 61212615561.

16551621216 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 1 + 621 + 21 + 6 = 666.

16551621216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725575 + ... + 748038.

It is an arithmetic number, because the mean of its divisors is an integer number (541553145).

Almost surely, 2^16551621216 is an apocalyptic number.

16551621216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16551621216 is an abundant number, since it is smaller than the sum of its proper divisors (35437480704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16551621216 is a wasteful number, since it uses less digits than its factorization.

16551621216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473645 (or 1473631 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 16551621216 in words is "sixteen billion, five hundred fifty-one million, six hundred twenty-one thousand, two hundred sixteen".