72507408691 has 2 divisors, whose sum is σ = 72507408692. Its totient is φ = 72507408690.

The previous prime is 72507408661. The next prime is 72507408737. The reversal of 72507408691 is 19680470527.

It is a weak prime.

It is an emirp because it is prime and its reverse (19680470527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72507408691 - 2⁹ = 72507408179 is a prime.

It is not a weakly prime, because it can be changed into another prime (72507408661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36253704345 + 36253704346.

It is an arithmetic number, because the mean of its divisors is an integer number (36253704346).

Almost surely, 2^72507408691 is an apocalyptic number.

72507408691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72507408691 is an equidigital number, since it uses as much as digits as its factorization.

72507408691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 72507408691 in words is "seventy-two billion, five hundred seven million, four hundred eight thousand, six hundred ninety-one".