165161522012720 has 40 divisors (see below), whose sum is σ = 404211093350640. Its totient is φ = 62587524130560.

The previous prime is 165161522012713. The next prime is 165161522012743. The reversal of 165161522012720 is 27210225161561.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54329446511 + ... + 54329449550.

It is an arithmetic number, because the mean of its divisors is an integer number (10105277333766).

Almost surely, 2^{165161522012720} is an apocalyptic number.

165161522012720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165161522012720 is an abundant number, since it is smaller than the sum of its proper divisors (239049571337920).

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

165161522012720 is a wasteful number, since it uses less digits than its factorization.

165161522012720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108658896093 (or 108658896087 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 165161522012720 in words is "one hundred sixty-five trillion, one hundred sixty-one billion, five hundred twenty-two million, twelve thousand, seven hundred twenty".