161381669041 has 2 divisors, whose sum is σ = 161381669042. Its totient is φ = 161381669040.

The previous prime is 161381669017. The next prime is 161381669081. The reversal of 161381669041 is 140966183161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158862030625 + 2519638416 = 398575^2 + 50196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161381669041 is a prime.

It is a super-3 number, since 3×161381669041³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161381668982 and 161381669000.

It is not a weakly prime, because it can be changed into another prime (161381669081) 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, 80690834520 + 80690834521.

It is an arithmetic number, because the mean of its divisors is an integer number (80690834521).

Almost surely, 2^161381669041 is an apocalyptic number.

It is an amenable number.

161381669041 is a deficient number, since it is larger than the sum of its proper divisors (1).

161381669041 is an equidigital number, since it uses as much as digits as its factorization.

161381669041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 161381669041 in words is "one hundred sixty-one billion, three hundred eighty-one million, six hundred sixty-nine thousand, forty-one".