66657940800 has 168 divisors, whose sum is σ = 238575018912. Its totient is φ = 16159488000.

The previous prime is 66657940793. The next prime is 66657940847. The reversal of 66657940800 is 804975666.

66657940800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 578431 + ... + 684030.

Almost surely, 2^66657940800 is an apocalyptic number.

66657940800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66657940800 is an abundant number, since it is smaller than the sum of its proper divisors (171917078112).

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

66657940800 is a wasteful number, since it uses less digits than its factorization.

66657940800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262497 (or 1262482 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 66657940800 in words is "sixty-six billion, six hundred fifty-seven million, nine hundred forty thousand, eight hundred".