66550408470 has 576 divisors, whose sum is σ = 233780391936. Its totient is φ = 12775034880.

The previous prime is 66550408447. The next prime is 66550408471. The reversal of 66550408470 is 7480405566.

66550408470 is a `hidden beast` number, since 6 + 65 + 504 + 0 + 84 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550408471) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 73373757 + ... + 73374663.

It is an arithmetic number, because the mean of its divisors is an integer number (405868736).

Almost surely, 2^66550408470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66550408470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116890195968).

66550408470 is an abundant number, since it is smaller than the sum of its proper divisors (167229983466).

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

66550408470 is a wasteful number, since it uses less digits than its factorization.

66550408470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 66550408470 in words is "sixty-six billion, five hundred fifty million, four hundred eight thousand, four hundred seventy".