72217271479 has 2 divisors, whose sum is σ = 72217271480. Its totient is φ = 72217271478.

The previous prime is 72217271473. The next prime is 72217271519. The reversal of 72217271479 is 97417271227.

It is a weak prime.

It is an emirp because it is prime and its reverse (97417271227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72217271479 - 2³ = 72217271471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72217271471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36108635739 + 36108635740.

It is an arithmetic number, because the mean of its divisors is an integer number (36108635740).

Almost surely, 2^72217271479 is an apocalyptic number.

72217271479 is a deficient number, since it is larger than the sum of its proper divisors (1).

72217271479 is an equidigital number, since it uses as much as digits as its factorization.

72217271479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691488, while the sum is 49.

The spelling of 72217271479 in words is "seventy-two billion, two hundred seventeen million, two hundred seventy-one thousand, four hundred seventy-nine".