1666540425168 has 30 divisors (see below), whose sum is σ = 4663998551394. Its totient is φ = 555513475008.

The previous prime is 1666540425157. The next prime is 1666540425197. The reversal of 1666540425168 is 8615240456661.

It can be written as a sum of positive squares in only one way, i.e., 1645391121984 + 21149303184 = 1282728^2 + 145428^2 .

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 5 ways as a sum of consecutive naturals, for example, 5786598555 + ... + 5786598842.

Almost surely, 2^{1666540425168} is an apocalyptic number.

1666540425168 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1666540425168 is an abundant number, since it is smaller than the sum of its proper divisors (2997458126226).

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

1666540425168 is a wasteful number, since it uses less digits than its factorization.

1666540425168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11573197411 (or 11573197402 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 1666540425168 in words is "one trillion, six hundred sixty-six billion, five hundred forty million, four hundred twenty-five thousand, one hundred sixty-eight".