66124280320 has 320 divisors, whose sum is σ = 192098776320. Its totient is φ = 21323907072.

The previous prime is 66124280317. The next prime is 66124280329. The reversal of 66124280320 is 2308242166.

It is a tau number, because it is divible by the number of its divisors (320).

It is not an unprimeable number, because it can be changed into a prime (66124280329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53454742 + ... + 53455978.

It is an arithmetic number, because the mean of its divisors is an integer number (600308676).

Almost surely, 2^66124280320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66124280320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96049388160).

66124280320 is an abundant number, since it is smaller than the sum of its proper divisors (125974496000).

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

66124280320 is a wasteful number, since it uses less digits than its factorization.

66124280320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 66124280320 in words is "sixty-six billion, one hundred twenty-four million, two hundred eighty thousand, three hundred twenty".