72147907457 has 2 divisors, whose sum is σ = 72147907458. Its totient is φ = 72147907456.

The previous prime is 72147907423. The next prime is 72147907487. The reversal of 72147907457 is 75470974127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53974440976 + 18173466481 = 232324^2 + 134809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72147907457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72147907399 and 72147907408.

It is not a weakly prime, because it can be changed into another prime (72147907487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36073953728 + 36073953729.

It is an arithmetic number, because the mean of its divisors is an integer number (36073953729).

Almost surely, 2^72147907457 is an apocalyptic number.

It is an amenable number.

72147907457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72147907457 is an equidigital number, since it uses as much as digits as its factorization.

72147907457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 53.

The spelling of 72147907457 in words is "seventy-two billion, one hundred forty-seven million, nine hundred seven thousand, four hundred fifty-seven".