659981520 has 400 divisors, whose sum is σ = 2566764288. Its totient is φ = 155796480.

The previous prime is 659981519. The next prime is 659981627. The reversal of 659981520 is 25189956.

659981520 is a `hidden beast` number, since 6 + 599 + 8 + 1 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3350062 + ... + 3350258.

Almost surely, 2^659981520 is an apocalyptic number.

659981520 is a gapful number since it is divisible by the number (60) 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 659981520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283382144).

659981520 is an abundant number, since it is smaller than the sum of its proper divisors (1906782768).

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

659981520 is a wasteful number, since it uses less digits than its factorization.

659981520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 659981520 is about 25690.1054883004. The cubic root of 659981520 is about 870.6506428930.

The spelling of 659981520 in words is "six hundred fifty-nine million, nine hundred eighty-one thousand, five hundred twenty".