66698595600 has 1920 divisors, whose sum is σ = 307500318720. Its totient is φ = 11943936000.

The previous prime is 66698595599. The next prime is 66698595629. The reversal of 66698595600 is 659589666.

66698595600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1093419570 + ... + 1093419630.

It is an arithmetic number, because the mean of its divisors is an integer number (160156416).

Almost surely, 2^66698595600 is an apocalyptic number.

66698595600 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 66698595600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153750159360).

66698595600 is an abundant number, since it is smaller than the sum of its proper divisors (240801723120).

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

66698595600 is a wasteful number, since it uses less digits than its factorization.

66698595600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 60.

The spelling of 66698595600 in words is "sixty-six billion, six hundred ninety-eight million, five hundred ninety-five thousand, six hundred".