6660720121284 has 72 divisors (see below), whose sum is σ = 17253191434752. Its totient is φ = 2165369857920.

The previous prime is 6660720121277. The next prime is 6660720121351. The reversal of 6660720121284 is 4821210270666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3715557 + ... + 5208339.

It is an arithmetic number, because the mean of its divisors is an integer number (239627658816).

Almost surely, 2^{6660720121284} 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 6660720121284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8626595717376).

6660720121284 is an abundant number, since it is smaller than the sum of its proper divisors (10592471313468).

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

6660720121284 is a wasteful number, since it uses less digits than its factorization.

6660720121284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495857 (or 1495852 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 6660720121284 in words is "six trillion, six hundred sixty billion, seven hundred twenty million, one hundred twenty-one thousand, two hundred eighty-four".