166278887511584 has 12 divisors (see below), whose sum is σ = 327361559788494. Its totient is φ = 83139443755776.

The previous prime is 166278887511509. The next prime is 166278887511617. The reversal of 166278887511584 is 485115788872661.

It can be written as a sum of positive squares in only one way, i.e., 162735231859984 + 3543655651600 = 12756772^2 + 1882460^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2598107617337 + ... + 2598107617400.

Almost surely, 2^{166278887511584} is an apocalyptic number.

It is an amenable number.

166278887511584 is a deficient number, since it is larger than the sum of its proper divisors (161082672276910).

166278887511584 is an equidigital number, since it uses as much as digits as its factorization.

166278887511584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196215234747 (or 5196215234739 counting only the distinct ones).

The product of its digits is 1445068800, while the sum is 77.

The spelling of 166278887511584 in words is "one hundred sixty-six trillion, two hundred seventy-eight billion, eight hundred eighty-seven million, five hundred eleven thousand, five hundred eighty-four".