72297166009 has 2 divisors, whose sum is σ = 72297166010. Its totient is φ = 72297166008.

The previous prime is 72297165979. The next prime is 72297166037. The reversal of 72297166009 is 90066179227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70944986025 + 1352179984 = 266355^2 + 36772^2 .

It is an emirp because it is prime and its reverse (90066179227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72297166009 - 2⁷ = 72297165881 is a prime.

It is not a weakly prime, because it can be changed into another prime (72297166099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36148583004 + 36148583005.

It is an arithmetic number, because the mean of its divisors is an integer number (36148583005).

Almost surely, 2^72297166009 is an apocalyptic number.

It is an amenable number.

72297166009 is a deficient number, since it is larger than the sum of its proper divisors (1).

72297166009 is an equidigital number, since it uses as much as digits as its factorization.

72297166009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 72297166009 in words is "seventy-two billion, two hundred ninety-seven million, one hundred sixty-six thousand, nine".