181922208168973 has 2 divisors, whose sum is σ = 181922208168974. Its totient is φ = 181922208168972.

The previous prime is 181922208168941. The next prime is 181922208168991. The reversal of 181922208168973 is 379861802229181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180266552090244 + 1655656078729 = 13426338^2 + 1286723^2 .

It is a cyclic number.

It is not a de Polignac number, because 181922208168973 - 2⁵ = 181922208168941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181922208168899 and 181922208168908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181922208168373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90961104084486 + 90961104084487.

It is an arithmetic number, because the mean of its divisors is an integer number (90961104084487).

Almost surely, 2^{181922208168973} is an apocalyptic number.

It is an amenable number.

181922208168973 is a deficient number, since it is larger than the sum of its proper divisors (1).

181922208168973 is an equidigital number, since it uses as much as digits as its factorization.

181922208168973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 67.

The spelling of 181922208168973 in words is "one hundred eighty-one trillion, nine hundred twenty-two billion, two hundred eight million, one hundred sixty-eight thousand, nine hundred seventy-three".