72069878381 has 2 divisors, whose sum is σ = 72069878382. Its totient is φ = 72069878380.

The previous prime is 72069878317. The next prime is 72069878411. The reversal of 72069878381 is 18387896027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43322675881 + 28747202500 = 208141^2 + 169550^2 .

It is a cyclic number.

It is not a de Polignac number, because 72069878381 - 2⁶ = 72069878317 is a prime.

It is a super-2 number, since 2×72069878381² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72069878381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72069878281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36034939190 + 36034939191.

It is an arithmetic number, because the mean of its divisors is an integer number (36034939191).

Almost surely, 2^72069878381 is an apocalyptic number.

It is an amenable number.

72069878381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72069878381 is an equidigital number, since it uses as much as digits as its factorization.

72069878381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 72069878381 in words is "seventy-two billion, sixty-nine million, eight hundred seventy-eight thousand, three hundred eighty-one".