161801233337 has 2 divisors, whose sum is σ = 161801233338. Its totient is φ = 161801233336.

The previous prime is 161801233331. The next prime is 161801233339. The reversal of 161801233337 is 733332108161.

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., 147939467641 + 13861765696 = 384629^2 + 117736^2 .

It is a cyclic number.

It is not a de Polignac number, because 161801233337 - 2²⁰ = 161800184761 is a prime.

Together with 161801233339, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161801233337.

It is not a weakly prime, because it can be changed into another prime (161801233331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80900616668 + 80900616669.

It is an arithmetic number, because the mean of its divisors is an integer number (80900616669).

Almost surely, 2^161801233337 is an apocalyptic number.

It is an amenable number.

161801233337 is a deficient number, since it is larger than the sum of its proper divisors (1).

161801233337 is an equidigital number, since it uses as much as digits as its factorization.

161801233337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 161801233337 in words is "one hundred sixty-one billion, eight hundred one million, two hundred thirty-three thousand, three hundred thirty-seven".