66270781320 has 128 divisors (see below), whose sum is σ = 203794496640. Its totient is φ = 17229916160.

The previous prime is 66270781273. The next prime is 66270781333. The reversal of 66270781320 is 2318707266.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9703747 + ... + 9710573.

It is an arithmetic number, because the mean of its divisors is an integer number (1592144505).

Almost surely, 2^66270781320 is an apocalyptic number.

66270781320 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 66270781320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101897248320).

66270781320 is an abundant number, since it is smaller than the sum of its proper divisors (137523715320).

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

66270781320 is a wasteful number, since it uses less digits than its factorization.

66270781320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8855 (or 8851 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 66270781320 in words is "sixty-six billion, two hundred seventy million, seven hundred eighty-one thousand, three hundred twenty".