72397700509 has 2 divisors, whose sum is σ = 72397700510. Its totient is φ = 72397700508.

The previous prime is 72397700449. The next prime is 72397700521. The reversal of 72397700509 is 90500779327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36635108409 + 35762592100 = 191403^2 + 189110^2 .

It is a cyclic number.

It is not a de Polignac number, because 72397700509 - 2¹⁷ = 72397569437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72397700549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36198850254 + 36198850255.

It is an arithmetic number, because the mean of its divisors is an integer number (36198850255).

Almost surely, 2^72397700509 is an apocalyptic number.

It is an amenable number.

72397700509 is a deficient number, since it is larger than the sum of its proper divisors (1).

72397700509 is an equidigital number, since it uses as much as digits as its factorization.

72397700509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 833490, while the sum is 49.

The spelling of 72397700509 in words is "seventy-two billion, three hundred ninety-seven million, seven hundred thousand, five hundred nine".