660789401472 has 128 divisors (see below), whose sum is σ = 1951018423200. Its totient is φ = 220175953920.

The previous prime is 660789401443. The next prime is 660789401497. The reversal of 660789401472 is 274104987066.

660789401472 is a `hidden beast` number, since 6 + 60 + 78 + 9 + 40 + 1 + 472 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9007822 + ... + 9080882.

Almost surely, 2^660789401472 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 660789401472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975509211600).

660789401472 is an abundant number, since it is smaller than the sum of its proper divisors (1290229021728).

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

660789401472 is a wasteful number, since it uses less digits than its factorization.

660789401472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75701 (or 75683 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 660789401472 in words is "six hundred sixty billion, seven hundred eighty-nine million, four hundred one thousand, four hundred seventy-two".