161801231337 has 6 divisors (see below), whose sum is σ = 233712889722. Its totient is φ = 107867487552.

The previous prime is 161801231321. The next prime is 161801231353. The reversal of 161801231337 is 733132108161.

161801231337 is a `hidden beast` number, since 1 + 618 + 0 + 1 + 2 + 3 + 1 + 3 + 37 = 666.

It is an interprime number because it is at equal distance from previous prime (161801231321) and next prime (161801231353).

It can be written as a sum of positive squares in only one way, i.e., 126269358336 + 35531873001 = 355344^2 + 188499^2 .

It is not a de Polignac number, because 161801231337 - 2⁴ = 161801231321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161801233337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8988957288 + ... + 8988957305.

It is an arithmetic number, because the mean of its divisors is an integer number (38952148287).

Almost surely, 2^161801231337 is an apocalyptic number.

It is an amenable number.

161801231337 is a deficient number, since it is larger than the sum of its proper divisors (71911658385).

161801231337 is a wasteful number, since it uses less digits than its factorization.

161801231337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17977914599 (or 17977914596 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

Adding to 161801231337 its reverse (733132108161), we get a palindrome (894933339498).

The spelling of 161801231337 in words is "one hundred sixty-one billion, eight hundred one million, two hundred thirty-one thousand, three hundred thirty-seven".