659681725728 has 48 divisors (see below), whose sum is σ = 1732782844800. Its totient is φ = 219751900416.

The previous prime is 659681725727. The next prime is 659681725733. The reversal of 659681725728 is 827527186956.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (659681725721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2069400 + ... + 2366807.

It is an arithmetic number, because the mean of its divisors is an integer number (36099642600).

Almost surely, 2^659681725728 is an apocalyptic number.

It is an amenable number.

659681725728 is an abundant number, since it is smaller than the sum of its proper divisors (1073101119072).

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

659681725728 is a wasteful number, since it uses less digits than its factorization.

659681725728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437769 (or 4437761 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 66.

The spelling of 659681725728 in words is "six hundred fifty-nine billion, six hundred eighty-one million, seven hundred twenty-five thousand, seven hundred twenty-eight".