666757425600 has 1008 divisors, whose sum is σ = 2810205403200. Its totient is φ = 149835571200.

The previous prime is 666757425491. The next prime is 666757425611. The reversal of 666757425600 is 6524757666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 301290094 + ... + 301292306.

Almost surely, 2^666757425600 is an apocalyptic number.

666757425600 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 666757425600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1405102701600).

666757425600 is an abundant number, since it is smaller than the sum of its proper divisors (2143447977600).

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

666757425600 is a wasteful number, since it uses less digits than its factorization.

666757425600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 54.

The spelling of 666757425600 in words is "six hundred sixty-six billion, seven hundred fifty-seven million, four hundred twenty-five thousand, six hundred".