72257373173 has 2 divisors, whose sum is σ = 72257373174. Its totient is φ = 72257373172.

The previous prime is 72257373143. The next prime is 72257373187. The reversal of 72257373173 is 37137375227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50993317489 + 21264055684 = 225817^2 + 145822^2 .

It is a cyclic number.

It is not a de Polignac number, because 72257373173 - 2¹⁰ = 72257372149 is a prime.

It is a super-2 number, since 2×72257373173² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72257373143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36128686586 + 36128686587.

It is an arithmetic number, because the mean of its divisors is an integer number (36128686587).

Almost surely, 2^72257373173 is an apocalyptic number.

It is an amenable number.

72257373173 is a deficient number, since it is larger than the sum of its proper divisors (1).

72257373173 is an equidigital number, since it uses as much as digits as its factorization.

72257373173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296540, while the sum is 47.

The spelling of 72257373173 in words is "seventy-two billion, two hundred fifty-seven million, three hundred seventy-three thousand, one hundred seventy-three".