72069878281 has 2 divisors, whose sum is σ = 72069878282. Its totient is φ = 72069878280.

The previous prime is 72069878267. The next prime is 72069878317. The reversal of 72069878281 is 18287896027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48173665225 + 23896213056 = 219485^2 + 154584^2 .

It is an emirp because it is prime and its reverse (18287896027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72069878281 - 2⁵ = 72069878249 is a prime.

It is a super-3 number, since 3×72069878281³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (72069878261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36034939140 + 36034939141.

It is an arithmetic number, because the mean of its divisors is an integer number (36034939141).

Almost surely, 2^72069878281 is an apocalyptic number.

It is an amenable number.

72069878281 is a deficient number, since it is larger than the sum of its proper divisors (1).

72069878281 is an equidigital number, since it uses as much as digits as its factorization.

72069878281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 72069878281 in words is "seventy-two billion, sixty-nine million, eight hundred seventy-eight thousand, two hundred eighty-one".