161358163481 has 2 divisors, whose sum is σ = 161358163482. Its totient is φ = 161358163480.

The previous prime is 161358163403. The next prime is 161358163489. The reversal of 161358163481 is 184361853161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156012360256 + 5345803225 = 394984^2 + 73115^2 .

It is a cyclic number.

It is not a de Polignac number, because 161358163481 - 2²² = 161353969177 is a prime.

It is a super-2 number, since 2×161358163481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161358163489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80679081740 + 80679081741.

It is an arithmetic number, because the mean of its divisors is an integer number (80679081741).

Almost surely, 2^161358163481 is an apocalyptic number.

It is an amenable number.

161358163481 is a deficient number, since it is larger than the sum of its proper divisors (1).

161358163481 is an equidigital number, since it uses as much as digits as its factorization.

161358163481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 47.

The spelling of 161358163481 in words is "one hundred sixty-one billion, three hundred fifty-eight million, one hundred sixty-three thousand, four hundred eighty-one".