72770238757 has 2 divisors, whose sum is σ = 72770238758. Its totient is φ = 72770238756.

The previous prime is 72770238647. The next prime is 72770238781. The reversal of 72770238757 is 75783207727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62897630436 + 9872608321 = 250794^2 + 99361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72770238757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72770238698 and 72770238707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72770238797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36385119378 + 36385119379.

It is an arithmetic number, because the mean of its divisors is an integer number (36385119379).

Almost surely, 2^72770238757 is an apocalyptic number.

It is an amenable number.

72770238757 is a deficient number, since it is larger than the sum of its proper divisors (1).

72770238757 is an equidigital number, since it uses as much as digits as its factorization.

72770238757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8067360, while the sum is 55.

The spelling of 72770238757 in words is "seventy-two billion, seven hundred seventy million, two hundred thirty-eight thousand, seven hundred fifty-seven".