72647519957 has 2 divisors, whose sum is σ = 72647519958. Its totient is φ = 72647519956.

The previous prime is 72647519947. The next prime is 72647519999. The reversal of 72647519957 is 75991574627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64641028516 + 8006491441 = 254246^2 + 89479^2 .

It is a cyclic number.

It is not a de Polignac number, because 72647519957 - 2¹⁴ = 72647503573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72647519957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72647519927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36323759978 + 36323759979.

It is an arithmetic number, because the mean of its divisors is an integer number (36323759979).

Almost surely, 2^72647519957 is an apocalyptic number.

It is an amenable number.

72647519957 is a deficient number, since it is larger than the sum of its proper divisors (1).

72647519957 is an equidigital number, since it uses as much as digits as its factorization.

72647519957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33339600, while the sum is 62.

The spelling of 72647519957 in words is "seventy-two billion, six hundred forty-seven million, five hundred nineteen thousand, nine hundred fifty-seven".