66358747280 has 160 divisors (see below), whose sum is σ = 181295539200. Its totient is φ = 22116741120.

The previous prime is 66358747261. The next prime is 66358747439. The reversal of 66358747280 is 8274785366.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 3913220 + ... + 3930140.

It is an arithmetic number, because the mean of its divisors is an integer number (1133097120).

Almost surely, 2^66358747280 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 66358747280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90647769600).

66358747280 is an abundant number, since it is smaller than the sum of its proper divisors (114936791920).

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

66358747280 is a wasteful number, since it uses less digits than its factorization.

66358747280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17137 (or 17131 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 66358747280 in words is "sixty-six billion, three hundred fifty-eight million, seven hundred forty-seven thousand, two hundred eighty".