1659785621136 has 80 divisors (see below), whose sum is σ = 4315651012800. Its totient is φ = 549668021760.

The previous prime is 1659785621063. The next prime is 1659785621159. The reversal of 1659785621136 is 6311265879561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1659785621136.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22347390 + ... + 22421538.

It is an arithmetic number, because the mean of its divisors is an integer number (53945637660).

Almost surely, 2^{1659785621136} is an apocalyptic number.

1659785621136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1659785621136 is an abundant number, since it is smaller than the sum of its proper divisors (2655865391664).

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

1659785621136 is a wasteful number, since it uses less digits than its factorization.

1659785621136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77184 (or 77178 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 60.

The spelling of 1659785621136 in words is "one trillion, six hundred fifty-nine billion, seven hundred eighty-five million, six hundred twenty-one thousand, one hundred thirty-six".