1659688456980 has 96 divisors (see below), whose sum is σ = 4693707502848. Its totient is φ = 438148480000.

The previous prime is 1659688456919. The next prime is 1659688457017. The reversal of 1659688456980 is 896548869561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93321169 + ... + 93338951.

It is an arithmetic number, because the mean of its divisors is an integer number (48892786488).

Almost surely, 2^{1659688456980} is an apocalyptic number.

1659688456980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659688456980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346853751424).

1659688456980 is an abundant number, since it is smaller than the sum of its proper divisors (3034019045868).

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

1659688456980 is a wasteful number, since it uses less digits than its factorization.

1659688456980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33297 (or 33295 counting only the distinct ones).

The product of its (nonzero) digits is 895795200, while the sum is 75.

The spelling of 1659688456980 in words is "one trillion, six hundred fifty-nine billion, six hundred eighty-eight million, four hundred fifty-six thousand, nine hundred eighty".