165605052565740 has 96 divisors (see below), whose sum is σ = 470372827700160. Its totient is φ = 43529480994816.

The previous prime is 165605052565723. The next prime is 165605052565747. The reversal of 165605052565740 is 47565250506561.

It is not an unprimeable number, because it can be changed into a prime (165605052565747) 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, 64338489 + ... + 66862928.

It is an arithmetic number, because the mean of its divisors is an integer number (4899716955210).

Almost surely, 2^{165605052565740} is an apocalyptic number.

165605052565740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165605052565740 is an abundant number, since it is smaller than the sum of its proper divisors (304767775134420).

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

165605052565740 is a wasteful number, since it uses less digits than its factorization.

165605052565740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131201731 (or 131201729 counting only the distinct ones).

The product of its (nonzero) digits is 37800000, while the sum is 57.

The spelling of 165605052565740 in words is "one hundred sixty-five trillion, six hundred five billion, fifty-two million, five hundred sixty-five thousand, seven hundred forty".