665058871428 has 384 divisors, whose sum is σ = 1965822566400. Its totient is φ = 170621509632.

The previous prime is 665058871381. The next prime is 665058871439. The reversal of 665058871428 is 824178850566.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2472337678 + ... + 2472337946.

It is an arithmetic number, because the mean of its divisors is an integer number (5119329600).

Almost surely, 2^665058871428 is an apocalyptic number.

665058871428 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 665058871428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982911283200).

665058871428 is an abundant number, since it is smaller than the sum of its proper divisors (1300763694972).

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

665058871428 is a wasteful number, since it uses less digits than its factorization.

665058871428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 60.

The spelling of 665058871428 in words is "six hundred sixty-five billion, fifty-eight million, eight hundred seventy-one thousand, four hundred twenty-eight".