161601166000165 has 32 divisors (see below), whose sum is σ = 203168010839040. Its totient is φ = 123241215398400.

The previous prime is 161601166000123. The next prime is 161601166000189. The reversal of 161601166000165 is 561000661106161.

It is not a de Polignac number, because 161601166000165 - 2³¹ = 161599018516517 is a prime.

It is a super-2 number, since 2×161601166000165² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999672745 + ... + 999834385.

It is an arithmetic number, because the mean of its divisors is an integer number (6349000338720).

Almost surely, 2^{161601166000165} is an apocalyptic number.

It is an amenable number.

161601166000165 is a deficient number, since it is larger than the sum of its proper divisors (41566844838875).

161601166000165 is a wasteful number, since it uses less digits than its factorization.

161601166000165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258013.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 161601166000165 in words is "one hundred sixty-one trillion, six hundred one billion, one hundred sixty-six million, one hundred sixty-five", and thus it is an aban number.