1659621120 has 432 divisors, whose sum is σ = 5968152960. Its totient is φ = 391716864.

The previous prime is 1659621079. The next prime is 1659621121. The reversal of 1659621120 is 211269561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659621121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38595819 + ... + 38595861.

Almost surely, 2^1659621120 is an apocalyptic number.

1659621120 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 1659621120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2984076480).

1659621120 is an abundant number, since it is smaller than the sum of its proper divisors (4308531840).

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

1659621120 is a wasteful number, since it uses less digits than its factorization.

1659621120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1659621120 is about 40738.4476876574. The cubic root of 1659621120 is about 1183.9580579250.

The spelling of 1659621120 in words is "one billion, six hundred fifty-nine million, six hundred twenty-one thousand, one hundred twenty".