72320607691 has 2 divisors, whose sum is σ = 72320607692. Its totient is φ = 72320607690.

The previous prime is 72320607673. The next prime is 72320607731. The reversal of 72320607691 is 19670602327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72320607691 - 2¹⁵ = 72320574923 is a prime.

It is not a weakly prime, because it can be changed into another prime (72320607631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36160303845 + 36160303846.

It is an arithmetic number, because the mean of its divisors is an integer number (36160303846).

Almost surely, 2^72320607691 is an apocalyptic number.

72320607691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72320607691 is an equidigital number, since it uses as much as digits as its factorization.

72320607691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 72320607691 in words is "seventy-two billion, three hundred twenty million, six hundred seven thousand, six hundred ninety-one".