161522012117 has 4 divisors (see below), whose sum is σ = 168544708320. Its totient is φ = 154499315916.

The previous prime is 161522012087. The next prime is 161522012123. The reversal of 161522012117 is 711210225161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 711210225161 = 557 ⋅1276858573.

It is a cyclic number.

It is not a de Polignac number, because 161522012117 - 2³⁴ = 144342142933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161522012117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161522012147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511348067 + ... + 3511348112.

It is an arithmetic number, because the mean of its divisors is an integer number (42136177080).

Almost surely, 2^161522012117 is an apocalyptic number.

It is an amenable number.

161522012117 is a deficient number, since it is larger than the sum of its proper divisors (7022696203).

161522012117 is an equidigital number, since it uses as much as digits as its factorization.

161522012117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022696202.

The product of its (nonzero) digits is 1680, while the sum is 29.

Adding to 161522012117 its reverse (711210225161), we get a palindrome (872732237278).

The spelling of 161522012117 in words is "one hundred sixty-one billion, five hundred twenty-two million, twelve thousand, one hundred seventeen".