77319813133 has 2 divisors, whose sum is σ = 77319813134. Its totient is φ = 77319813132.

The previous prime is 77319813107. The next prime is 77319813199. The reversal of 77319813133 is 33131891377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70890660009 + 6429153124 = 266253^2 + 80182^2 .

It is a cyclic number.

It is not a de Polignac number, because 77319813133 - 2⁵ = 77319813101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77319853133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38659906566 + 38659906567.

It is an arithmetic number, because the mean of its divisors is an integer number (38659906567).

Almost surely, 2^77319813133 is an apocalyptic number.

It is an amenable number.

77319813133 is a deficient number, since it is larger than the sum of its proper divisors (1).

77319813133 is an equidigital number, since it uses as much as digits as its factorization.

77319813133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 46.

The spelling of 77319813133 in words is "seventy-seven billion, three hundred nineteen million, eight hundred thirteen thousand, one hundred thirty-three".