72217673447 has 2 divisors, whose sum is σ = 72217673448. Its totient is φ = 72217673446.

The previous prime is 72217673399. The next prime is 72217673449. The reversal of 72217673447 is 74437671227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72217673447 - 2²⁰ = 72216624871 is a prime.

Together with 72217673449, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72217673395 and 72217673404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72217673449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36108836723 + 36108836724.

It is an arithmetic number, because the mean of its divisors is an integer number (36108836724).

Almost surely, 2^72217673447 is an apocalyptic number.

72217673447 is a deficient number, since it is larger than the sum of its proper divisors (1).

72217673447 is an equidigital number, since it uses as much as digits as its factorization.

72217673447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2765952, while the sum is 50.

The spelling of 72217673447 in words is "seventy-two billion, two hundred seventeen million, six hundred seventy-three thousand, four hundred forty-seven".