165256897728 has 224 divisors, whose sum is σ = 501105830400. Its totient is φ = 47614279680.

The previous prime is 165256897727. The next prime is 165256897733. The reversal of 165256897728 is 827798652561.

It is not an unprimeable number, because it can be changed into a prime (165256897727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8434183 + ... + 8453753.

It is an arithmetic number, because the mean of its divisors is an integer number (2237079600).

Almost surely, 2^165256897728 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 165256897728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250552915200).

165256897728 is an abundant number, since it is smaller than the sum of its proper divisors (335848932672).

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

165256897728 is a wasteful number, since it uses less digits than its factorization.

165256897728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19815 (or 19805 counting only the distinct ones).

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

The spelling of 165256897728 in words is "one hundred sixty-five billion, two hundred fifty-six million, eight hundred ninety-seven thousand, seven hundred twenty-eight".