16545661327764 has 72 divisors (see below), whose sum is σ = 43716528273600. Its totient is φ = 5266440993792.

The previous prime is 16545661327747. The next prime is 16545661327817. The reversal of 16545661327764 is 46772316654561.

16545661327764 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 5 + 6 + 613 + 2 + 7 + 7 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16534989 + ... + 17507060.

It is an arithmetic number, because the mean of its divisors is an integer number (607174003800).

Almost surely, 2^{16545661327764} is an apocalyptic number.

It is an amenable number.

16545661327764 is an abundant number, since it is smaller than the sum of its proper divisors (27170866945836).

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

16545661327764 is a wasteful number, since it uses less digits than its factorization.

16545661327764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34042669 (or 34042664 counting only the distinct ones).

The product of its digits is 152409600, while the sum is 63.

The spelling of 16545661327764 in words is "sixteen trillion, five hundred forty-five billion, six hundred sixty-one million, three hundred twenty-seven thousand, seven hundred sixty-four".