165611606453040 has 480 divisors, whose sum is σ = 605035579173120. Its totient is φ = 37146144358400.

The previous prime is 165611606453009. The next prime is 165611606453047. The reversal of 165611606453040 is 40354606116561.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (165611606453047) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43175110 + ... + 46854170.

It is an arithmetic number, because the mean of its divisors is an integer number (1260490789944).

Almost surely, 2^{165611606453040} is an apocalyptic number.

165611606453040 is a gapful number since it is divisible by the number (10) 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 165611606453040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302517789586560).

165611606453040 is an abundant number, since it is smaller than the sum of its proper divisors (439423972720080).

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

165611606453040 is a wasteful number, since it uses less digits than its factorization.

165611606453040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679181 (or 3679158 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 165611606453040 in words is "one hundred sixty-five trillion, six hundred eleven billion, six hundred six million, four hundred fifty-three thousand, forty".