238721165273 has 2 divisors, whose sum is σ = 238721165274. Its totient is φ = 238721165272.

The previous prime is 238721165269. The next prime is 238721165299. The reversal of 238721165273 is 372561127832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189318101449 + 49403063824 = 435107^2 + 222268^2 .

It is a cyclic number.

It is not a de Polignac number, because 238721165273 - 2² = 238721165269 is a prime.

It is not a weakly prime, because it can be changed into another prime (238721365273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119360582636 + 119360582637.

It is an arithmetic number, because the mean of its divisors is an integer number (119360582637).

Almost surely, 2^238721165273 is an apocalyptic number.

It is an amenable number.

238721165273 is a deficient number, since it is larger than the sum of its proper divisors (1).

238721165273 is an equidigital number, since it uses as much as digits as its factorization.

238721165273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 47.

The spelling of 238721165273 in words is "two hundred thirty-eight billion, seven hundred twenty-one million, one hundred sixty-five thousand, two hundred seventy-three".