72544330091 has 2 divisors, whose sum is σ = 72544330092. Its totient is φ = 72544330090.

The previous prime is 72544330069. The next prime is 72544330099. The reversal of 72544330091 is 19003344527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72544330091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72544330099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36272165045 + 36272165046.

It is an arithmetic number, because the mean of its divisors is an integer number (36272165046).

Almost surely, 2^72544330091 is an apocalyptic number.

72544330091 is a deficient number, since it is larger than the sum of its proper divisors (1).

72544330091 is an equidigital number, since it uses as much as digits as its factorization.

72544330091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 72544330091 in words is "seventy-two billion, five hundred forty-four million, three hundred thirty thousand, ninety-one".