1666751833440 has 144 divisors (see below), whose sum is σ = 5688734360400. Its totient is φ = 444393409536.

The previous prime is 1666751833421. The next prime is 1666751833441. The reversal of 1666751833440 is 443381576661.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666751833441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8876851 + ... + 9062669.

It is an arithmetic number, because the mean of its divisors is an integer number (39505099725).

Almost surely, 2^{1666751833440} is an apocalyptic number.

1666751833440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666751833440 is an abundant number, since it is smaller than the sum of its proper divisors (4021982526960).

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

1666751833440 is a wasteful number, since it uses less digits than its factorization.

1666751833440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192069 (or 192058 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 1666751833440 in words is "one trillion, six hundred sixty-six billion, seven hundred fifty-one million, eight hundred thirty-three thousand, four hundred forty".