72139940617 has 2 divisors, whose sum is σ = 72139940618. Its totient is φ = 72139940616.

The previous prime is 72139940599. The next prime is 72139940651. The reversal of 72139940617 is 71604993127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67365683401 + 4774257216 = 259549^2 + 69096^2 .

It is a cyclic number.

It is not a de Polignac number, because 72139940617 - 2¹⁵ = 72139907849 is a prime.

It is not a weakly prime, because it can be changed into another prime (72139940017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36069970308 + 36069970309.

It is an arithmetic number, because the mean of its divisors is an integer number (36069970309).

Almost surely, 2^72139940617 is an apocalyptic number.

It is an amenable number.

72139940617 is a deficient number, since it is larger than the sum of its proper divisors (1).

72139940617 is an equidigital number, since it uses as much as digits as its factorization.

72139940617 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 72139940617 in words is "seventy-two billion, one hundred thirty-nine million, nine hundred forty thousand, six hundred seventeen".