161220910090135 has 16 divisors (see below), whose sum is σ = 221111042904576. Its totient is φ = 110547440957088.

The previous prime is 161220910090063. The next prime is 161220910090139. The reversal of 161220910090135 is 531090019022161.

It is a cyclic number.

It is not a de Polignac number, because 161220910090135 - 2¹¹ = 161220910088087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161220910090139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83200297 + ... + 85115986.

It is an arithmetic number, because the mean of its divisors is an integer number (13819440181536).

Almost surely, 2^{161220910090135} is an apocalyptic number.

161220910090135 is a deficient number, since it is larger than the sum of its proper divisors (59890132814441).

161220910090135 is a wasteful number, since it uses less digits than its factorization.

161220910090135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168343662.

The product of its (nonzero) digits is 29160, while the sum is 40.

The spelling of 161220910090135 in words is "one hundred sixty-one trillion, two hundred twenty billion, nine hundred ten million, ninety thousand, one hundred thirty-five".