166553321256445 has 16 divisors (see below), whose sum is σ = 211201754120640. Its totient is φ = 125738718695424.

The previous prime is 166553321256403. The next prime is 166553321256461. The reversal of 166553321256445 is 544652123355661.

It is a cyclic number.

It is not a de Polignac number, because 166553321256445 - 2²⁵ = 166553287702013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166553321256445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3410856627 + ... + 3410905456.

It is an arithmetic number, because the mean of its divisors is an integer number (13200109632540).

Almost surely, 2^{166553321256445} is an apocalyptic number.

It is an amenable number.

166553321256445 is a deficient number, since it is larger than the sum of its proper divisors (44648432864195).

166553321256445 is a wasteful number, since it uses less digits than its factorization.

166553321256445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821762364.

The product of its digits is 77760000, while the sum is 58.

The spelling of 166553321256445 in words is "one hundred sixty-six trillion, five hundred fifty-three billion, three hundred twenty-one million, two hundred fifty-six thousand, four hundred forty-five".