72266081 has 2 divisors, whose sum is σ = 72266082. Its totient is φ = 72266080.

The previous prime is 72266041. The next prime is 72266107. The reversal of 72266081 is 18066227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 8410000 = 7991^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 72266081 - 2⁶ = 72266017 is a prime.

It is a super-2 number, since 2×72266081² = 10444772926197122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72266011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36133040 + 36133041.

It is an arithmetic number, because the mean of its divisors is an integer number (36133041).

Almost surely, 2^72266081 is an apocalyptic number.

It is an amenable number.

72266081 is a deficient number, since it is larger than the sum of its proper divisors (1).

72266081 is an equidigital number, since it uses as much as digits as its factorization.

72266081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 72266081 is about 8500.9458885468. The cubic root of 72266081 is about 416.5286075581.

The spelling of 72266081 in words is "seventy-two million, two hundred sixty-six thousand, eighty-one".