161068516081 has 12 divisors (see below), whose sum is σ = 187456505796. Its totient is φ = 137812632320.

The previous prime is 161068516051. The next prime is 161068516109. The reversal of 161068516081 is 180615860161.

It can be written as a sum of positive squares in 2 ways, for example, as 68862157056 + 92206359025 = 262416^2 + 303655^2 .

It is not a de Polignac number, because 161068516081 - 2³⁷ = 23629562609 is a prime.

It is a super-2 number, since 2×161068516081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161068516051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39149260 + ... + 39153373.

It is an arithmetic number, because the mean of its divisors is an integer number (15621375483).

Almost surely, 2^161068516081 is an apocalyptic number.

161068516081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161068516081 is a deficient number, since it is larger than the sum of its proper divisors (26387989715).

161068516081 is a wasteful number, since it uses less digits than its factorization.

161068516081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78302672 (or 78302661 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 161068516081 in words is "one hundred sixty-one billion, sixty-eight million, five hundred sixteen thousand, eighty-one".