660887115840 has 252 divisors, whose sum is σ = 2644307699436. Its totient is φ = 151059879936.

The previous prime is 660887115799. The next prime is 660887115853. The reversal of 660887115840 is 48511788066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 454524065856 + 206363049984 = 674184^2 + 454272^2 .

It is a tau number, because it is divible by the number of its divisors (252).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2200459 + ... + 2482698.

Almost surely, 2^660887115840 is an apocalyptic number.

660887115840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660887115840 is an abundant number, since it is smaller than the sum of its proper divisors (1983420583596).

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

660887115840 is a wasteful number, since it uses less digits than its factorization.

660887115840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683194 (or 4683174 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 660887115840 in words is "six hundred sixty billion, eight hundred eighty-seven million, one hundred fifteen thousand, eight hundred forty".