66471229440 has 2304 divisors, whose sum is σ = 331164288000. Its totient is φ = 11890851840.

The previous prime is 66471229427. The next prime is 66471229441. The reversal of 66471229440 is 4492217466.

It is a tau number, because it is divible by the number of its divisors (2304).

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 (66471229441) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2292111346 + ... + 2292111374.

It is an arithmetic number, because the mean of its divisors is an integer number (143734500).

Almost surely, 2^66471229440 is an apocalyptic number.

66471229440 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 66471229440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165582144000).

66471229440 is an abundant number, since it is smaller than the sum of its proper divisors (264693058560).

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

66471229440 is a wasteful number, since it uses less digits than its factorization.

66471229440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 66471229440 in words is "sixty-six billion, four hundred seventy-one million, two hundred twenty-nine thousand, four hundred forty".