1659385980 has 576 divisors, whose sum is σ = 6601728000. Its totient is φ = 345461760.

The previous prime is 1659385967. The next prime is 1659386009. The reversal of 1659385980 is 895839561.

It is a happy number.

1659385980 is a `hidden beast` number, since 16 + 5 + 9 + 38 + 598 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 53528565 + ... + 53528595.

Almost surely, 2^1659385980 is an apocalyptic number.

1659385980 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 1659385980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3300864000).

1659385980 is an abundant number, since it is smaller than the sum of its proper divisors (4942342020).

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

1659385980 is a wasteful number, since it uses less digits than its factorization.

1659385980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The square root of 1659385980 is about 40735.5616139019. The cubic root of 1659385980 is about 1183.9021397311.

The spelling of 1659385980 in words is "one billion, six hundred fifty-nine million, three hundred eighty-five thousand, nine hundred eighty".