77381685253 has 2 divisors, whose sum is σ = 77381685254. Its totient is φ = 77381685252.

The previous prime is 77381685247. The next prime is 77381685287. The reversal of 77381685253 is 35258618377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46916426404 + 30465258849 = 216602^2 + 174543^2 .

It is an emirp because it is prime and its reverse (35258618377) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77381685253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77381685194 and 77381685203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77381685223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38690842626 + 38690842627.

It is an arithmetic number, because the mean of its divisors is an integer number (38690842627).

Almost surely, 2^77381685253 is an apocalyptic number.

It is an amenable number.

77381685253 is a deficient number, since it is larger than the sum of its proper divisors (1).

77381685253 is an equidigital number, since it uses as much as digits as its factorization.

77381685253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 55.

The spelling of 77381685253 in words is "seventy-seven billion, three hundred eighty-one million, six hundred eighty-five thousand, two hundred fifty-three".