16554543666564 has 48 divisors (see below), whose sum is σ = 39512486494208. Its totient is φ = 5393018540448.

The previous prime is 16554543666547. The next prime is 16554543666653. The reversal of 16554543666564 is 46566634545561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16554543666495 and 16554543666504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80961784 + ... + 81165999.

Almost surely, 2^{16554543666564} is an apocalyptic number.

It is an amenable number.

16554543666564 is an abundant number, since it is smaller than the sum of its proper divisors (22957942827644).

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

16554543666564 is a wasteful number, since it uses less digits than its factorization.

16554543666564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162127984 (or 162127982 counting only the distinct ones).

The product of its digits is 933120000, while the sum is 66.

The spelling of 16554543666564 in words is "sixteen trillion, five hundred fifty-four billion, five hundred forty-three million, six hundred sixty-six thousand, five hundred sixty-four".