77138223713 has 2 divisors, whose sum is σ = 77138223714. Its totient is φ = 77138223712.

The previous prime is 77138223667. The next prime is 77138223727. The reversal of 77138223713 is 31732283177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40355586769 + 36782636944 = 200887^2 + 191788^2 .

It is a cyclic number.

It is not a de Polignac number, because 77138223713 - 2¹² = 77138219617 is a prime.

It is not a weakly prime, because it can be changed into another prime (77138223733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38569111856 + 38569111857.

It is an arithmetic number, because the mean of its divisors is an integer number (38569111857).

Almost surely, 2^77138223713 is an apocalyptic number.

It is an amenable number.

77138223713 is a deficient number, since it is larger than the sum of its proper divisors (1).

77138223713 is an equidigital number, since it uses as much as digits as its factorization.

77138223713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 44.

The spelling of 77138223713 in words is "seventy-seven billion, one hundred thirty-eight million, two hundred twenty-three thousand, seven hundred thirteen".