660899478528 has 176 divisors, whose sum is σ = 2042364936960. Its totient is φ = 210721370112.

The previous prime is 660899478523. The next prime is 660899478581. The reversal of 660899478528 is 825874998066.

660899478528 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 9 + 94 + 7 + 8 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660899478523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116251 + ... + 1155557.

Almost surely, 2^660899478528 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 660899478528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021182468480).

660899478528 is an abundant number, since it is smaller than the sum of its proper divisors (1381465458432).

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

660899478528 is a wasteful number, since it uses less digits than its factorization.

660899478528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039359 (or 1039335 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 72.

The spelling of 660899478528 in words is "six hundred sixty billion, eight hundred ninety-nine million, four hundred seventy-eight thousand, five hundred twenty-eight".