72770238647 has 2 divisors, whose sum is σ = 72770238648. Its totient is φ = 72770238646.

The previous prime is 72770238631. The next prime is 72770238757. The reversal of 72770238647 is 74683207727.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (74683207727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72770238647 - 2⁴ = 72770238631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72770238847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36385119323 + 36385119324.

It is an arithmetic number, because the mean of its divisors is an integer number (36385119324).

Almost surely, 2^72770238647 is an apocalyptic number.

72770238647 is a deficient number, since it is larger than the sum of its proper divisors (1).

72770238647 is an equidigital number, since it uses as much as digits as its factorization.

72770238647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5531904, while the sum is 53.

The spelling of 72770238647 in words is "seventy-two billion, seven hundred seventy million, two hundred thirty-eight thousand, six hundred forty-seven".