1666412787524 has 12 divisors (see below), whose sum is σ = 2971245442284. Its totient is φ = 817485518304.

The previous prime is 1666412787503. The next prime is 1666412787563. The reversal of 1666412787524 is 4257872146661.

It can be written as a sum of positive squares in 2 ways, for example, as 1378722156100 + 287690631424 = 1174190^2 + 536368^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3930218627 + ... + 3930219050.

It is an arithmetic number, because the mean of its divisors is an integer number (247603786857).

Almost surely, 2^{1666412787524} is an apocalyptic number.

It is an amenable number.

1666412787524 is a deficient number, since it is larger than the sum of its proper divisors (1304832654760).

1666412787524 is a wasteful number, since it uses less digits than its factorization.

1666412787524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860437734 (or 7860437732 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 59.

The spelling of 1666412787524 in words is "one trillion, six hundred sixty-six billion, four hundred twelve million, seven hundred eighty-seven thousand, five hundred twenty-four".