161405676337 has 2 divisors, whose sum is σ = 161405676338. Its totient is φ = 161405676336.

The previous prime is 161405676317. The next prime is 161405676373. The reversal of 161405676337 is 733676504161.

Together with next prime (161405676373) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128881718001 + 32523958336 = 359001^2 + 180344^2 .

It is a cyclic number.

It is not a de Polignac number, because 161405676337 - 2¹¹ = 161405674289 is a prime.

It is not a weakly prime, because it can be changed into another prime (161405676317) 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, 80702838168 + 80702838169.

It is an arithmetic number, because the mean of its divisors is an integer number (80702838169).

Almost surely, 2^161405676337 is an apocalyptic number.

It is an amenable number.

161405676337 is a deficient number, since it is larger than the sum of its proper divisors (1).

161405676337 is an equidigital number, since it uses as much as digits as its factorization.

161405676337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 161405676337 in words is "one hundred sixty-one billion, four hundred five million, six hundred seventy-six thousand, three hundred thirty-seven".