660991593600 has 288 divisors, whose sum is σ = 2539999343700. Its totient is φ = 162705530880.

The previous prime is 660991593583. The next prime is 660991593641. The reversal of 660991593600 is 6395199066.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 200754179136 + 460237414464 = 448056^2 + 678408^2 .

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 508335 + ... + 1257134.

Almost surely, 2^660991593600 is an apocalyptic number.

660991593600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660991593600 is an abundant number, since it is smaller than the sum of its proper divisors (1879007750100).

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

660991593600 is a wasteful number, since it uses less digits than its factorization.

660991593600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765512 (or 1765492 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 54.

The spelling of 660991593600 in words is "six hundred sixty billion, nine hundred ninety-one million, five hundred ninety-three thousand, six hundred".