665130038528 has 72 divisors (see below), whose sum is σ = 1406438953920. Its totient is φ = 312851128320.

The previous prime is 665130038513. The next prime is 665130038581. The reversal of 665130038528 is 825830031566.

665130038528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9238253 + ... + 9309971.

It is an arithmetic number, because the mean of its divisors is an integer number (19533874360).

Almost surely, 2^665130038528 is an apocalyptic number.

665130038528 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665130038528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703219476960).

665130038528 is an abundant number, since it is smaller than the sum of its proper divisors (741308915392).

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

665130038528 is a wasteful number, since it uses less digits than its factorization.

665130038528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73883 (or 73869 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 665130038528 in words is "six hundred sixty-five billion, one hundred thirty million, thirty-eight thousand, five hundred twenty-eight".