66475447500 has 480 divisors, whose sum is σ = 245873295360. Its totient is φ = 13572000000.

The previous prime is 66475447483. The next prime is 66475447501. The reversal of 66475447500 is 574457466.

It is a self number, because there is not a number n which added to its sum of digits gives 66475447500.

It is not an unprimeable number, because it can be changed into a prime (66475447501) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 34071525 + ... + 34073475.

It is an arithmetic number, because the mean of its divisors is an integer number (512236032).

Almost surely, 2^66475447500 is an apocalyptic number.

66475447500 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 66475447500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122936647680).

66475447500 is an abundant number, since it is smaller than the sum of its proper divisors (179397847860).

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

66475447500 is a wasteful number, since it uses less digits than its factorization.

66475447500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 66475447500 in words is "sixty-six billion, four hundred seventy-five million, four hundred forty-seven thousand, five hundred".