72174335209 has 2 divisors, whose sum is σ = 72174335210. Its totient is φ = 72174335208.

The previous prime is 72174335147. The next prime is 72174335213. The reversal of 72174335209 is 90253347127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69250554025 + 2923781184 = 263155^2 + 54072^2 .

It is a cyclic number.

It is not a de Polignac number, because 72174335209 - 2²¹ = 72172238057 is a prime.

It is a super-2 number, since 2×72174335209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72174335239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36087167604 + 36087167605.

It is an arithmetic number, because the mean of its divisors is an integer number (36087167605).

Almost surely, 2^72174335209 is an apocalyptic number.

It is an amenable number.

72174335209 is a deficient number, since it is larger than the sum of its proper divisors (1).

72174335209 is an equidigital number, since it uses as much as digits as its factorization.

72174335209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 72174335209 in words is "seventy-two billion, one hundred seventy-four million, three hundred thirty-five thousand, two hundred nine".