161130486581 has 2 divisors, whose sum is σ = 161130486582. Its totient is φ = 161130486580.

The previous prime is 161130486553. The next prime is 161130486593. The reversal of 161130486581 is 185684031161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152229507556 + 8900979025 = 390166^2 + 94345^2 .

It is a cyclic number.

It is not a de Polignac number, because 161130486581 - 2¹⁰ = 161130485557 is a prime.

It is a super-2 number, since 2×161130486581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161130486551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80565243290 + 80565243291.

It is an arithmetic number, because the mean of its divisors is an integer number (80565243291).

Almost surely, 2^161130486581 is an apocalyptic number.

It is an amenable number.

161130486581 is a deficient number, since it is larger than the sum of its proper divisors (1).

161130486581 is an equidigital number, since it uses as much as digits as its factorization.

161130486581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 161130486581 in words is "one hundred sixty-one billion, one hundred thirty million, four hundred eighty-six thousand, five hundred eighty-one".