165640824448 has 128 divisors (see below), whose sum is σ = 377540352000. Its totient is φ = 71653063680.

The previous prime is 165640824421. The next prime is 165640824457. The reversal of 165640824448 is 844428046561.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 165640824395 and 165640824404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6431565 + ... + 6457267.

It is an arithmetic number, because the mean of its divisors is an integer number (2949534000).

Almost surely, 2^165640824448 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 165640824448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188770176000).

165640824448 is an abundant number, since it is smaller than the sum of its proper divisors (211899527552).

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

165640824448 is a wasteful number, since it uses less digits than its factorization.

165640824448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25950 (or 25938 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 52.

The spelling of 165640824448 in words is "one hundred sixty-five billion, six hundred forty million, eight hundred twenty-four thousand, four hundred forty-eight".