72717131653 has 2 divisors, whose sum is σ = 72717131654. Its totient is φ = 72717131652.

The previous prime is 72717131651. The next prime is 72717131699. The reversal of 72717131653 is 35613171727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71876537604 + 840594049 = 268098^2 + 28993^2 .

It is a cyclic number.

It is not a de Polignac number, because 72717131653 - 2¹ = 72717131651 is a prime.

Together with 72717131651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72717131651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36358565826 + 36358565827.

It is an arithmetic number, because the mean of its divisors is an integer number (36358565827).

Almost surely, 2^72717131653 is an apocalyptic number.

It is an amenable number.

72717131653 is a deficient number, since it is larger than the sum of its proper divisors (1).

72717131653 is an equidigital number, since it uses as much as digits as its factorization.

72717131653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 43.

The spelling of 72717131653 in words is "seventy-two billion, seven hundred seventeen million, one hundred thirty-one thousand, six hundred fifty-three".