66841475400 has 288 divisors, whose sum is σ = 266046930240. Its totient is φ = 15277973760.

The previous prime is 66841475333. The next prime is 66841475471. The reversal of 66841475400 is 457414866.

66841475400 is a `hidden beast` number, since 6 + 68 + 4 + 1 + 47 + 540 + 0 = 666.

66841475400 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 (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 241962 + ... + 438438.

Almost surely, 2^66841475400 is an apocalyptic number.

66841475400 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 66841475400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133023465120).

66841475400 is an abundant number, since it is smaller than the sum of its proper divisors (199205454840).

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

66841475400 is a wasteful number, since it uses less digits than its factorization.

66841475400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196515 (or 196494 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 66841475400 in words is "sixty-six billion, eight hundred forty-one million, four hundred seventy-five thousand, four hundred".