1666665376290 has 64 divisors (see below), whose sum is σ = 4564561057920. Its totient is φ = 432432095040.

The previous prime is 1666665376247. The next prime is 1666665376297. The reversal of 1666665376290 is 926735666661.

It is not an unprimeable number, because it can be changed into a prime (1666665376297) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 83406696 + ... + 83426675.

It is an arithmetic number, because the mean of its divisors is an integer number (71321266530).

Almost surely, 2^{1666665376290} is an apocalyptic number.

1666665376290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666665376290 is an abundant number, since it is smaller than the sum of its proper divisors (2897895681630).

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

1666665376290 is a wasteful number, since it uses less digits than its factorization.

1666665376290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166833424 (or 166833418 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 63.

The spelling of 1666665376290 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-five million, three hundred seventy-six thousand, two hundred ninety".