72279297217 has 2 divisors, whose sum is σ = 72279297218. Its totient is φ = 72279297216.

The previous prime is 72279297187. The next prime is 72279297247. The reversal of 72279297217 is 71279297227.

It is a balanced prime because it is at equal distance from previous prime (72279297187) and next prime (72279297247).

It can be written as a sum of positive squares in only one way, i.e., 72201839616 + 77457601 = 268704^2 + 8801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72279297217 is a prime.

It is not a weakly prime, because it can be changed into another prime (72279297247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36139648608 + 36139648609.

It is an arithmetic number, because the mean of its divisors is an integer number (36139648609).

Almost surely, 2^72279297217 is an apocalyptic number.

It is an amenable number.

72279297217 is a deficient number, since it is larger than the sum of its proper divisors (1).

72279297217 is an equidigital number, since it uses as much as digits as its factorization.

72279297217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3111696, while the sum is 55.

The spelling of 72279297217 in words is "seventy-two billion, two hundred seventy-nine million, two hundred ninety-seven thousand, two hundred seventeen".