72858218161 has 2 divisors, whose sum is σ = 72858218162. Its totient is φ = 72858218160.

The previous prime is 72858218149. The next prime is 72858218201. The reversal of 72858218161 is 16181285827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38171390625 + 34686827536 = 195375^2 + 186244^2 .

It is a cyclic number.

It is not a de Polignac number, because 72858218161 - 2¹⁷ = 72858087089 is a prime.

It is not a weakly prime, because it can be changed into another prime (72858218261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36429109080 + 36429109081.

It is an arithmetic number, because the mean of its divisors is an integer number (36429109081).

Almost surely, 2^72858218161 is an apocalyptic number.

It is an amenable number.

72858218161 is a deficient number, since it is larger than the sum of its proper divisors (1).

72858218161 is an equidigital number, since it uses as much as digits as its factorization.

72858218161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 49.

The spelling of 72858218161 in words is "seventy-two billion, eight hundred fifty-eight million, two hundred eighteen thousand, one hundred sixty-one".