72970336217 has 2 divisors, whose sum is σ = 72970336218. Its totient is φ = 72970336216.

The previous prime is 72970336157. The next prime is 72970336303. The reversal of 72970336217 is 71263307927.

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., 65422896841 + 7547439376 = 255779^2 + 86876^2 .

It is a cyclic number.

It is not a de Polignac number, because 72970336217 - 2⁸ = 72970335961 is a prime.

It is not a weakly prime, because it can be changed into another prime (72970306217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36485168108 + 36485168109.

It is an arithmetic number, because the mean of its divisors is an integer number (36485168109).

Almost surely, 2^72970336217 is an apocalyptic number.

It is an amenable number.

72970336217 is a deficient number, since it is larger than the sum of its proper divisors (1).

72970336217 is an equidigital number, since it uses as much as digits as its factorization.

72970336217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 47.

The spelling of 72970336217 in words is "seventy-two billion, nine hundred seventy million, three hundred thirty-six thousand, two hundred seventeen".