1659989520 has 240 divisors, whose sum is σ = 6397447680. Its totient is φ = 377865216.

The previous prime is 1659989503. The next prime is 1659989537. The reversal of 1659989520 is 259899561.

It is an interprime number because it is at equal distance from previous prime (1659989503) and next prime (1659989537).

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1597161 + ... + 1598199.

It is an arithmetic number, because the mean of its divisors is an integer number (26656032).

Almost surely, 2^1659989520 is an apocalyptic number.

1659989520 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 1659989520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3198723840).

1659989520 is an abundant number, since it is smaller than the sum of its proper divisors (4737458160).

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

1659989520 is a wasteful number, since it uses less digits than its factorization.

1659989520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The square root of 1659989520 is about 40742.9689639820. The cubic root of 1659989520 is about 1184.0456558058.

The spelling of 1659989520 in words is "one billion, six hundred fifty-nine million, nine hundred eighty-nine thousand, five hundred twenty".