77391327133 has 4 divisors (see below), whose sum is σ = 77818903708. Its totient is φ = 76963750560.

The previous prime is 77391327109. The next prime is 77391327149. The reversal of 77391327133 is 33172319377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33172319377 = 1093 ⋅30349789.

It can be written as a sum of positive squares in 2 ways, for example, as 10978429284 + 66412897849 = 104778^2 + 257707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77391327133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77391322133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213788016 + ... + 213788377.

It is an arithmetic number, because the mean of its divisors is an integer number (19454725927).

Almost surely, 2^77391327133 is an apocalyptic number.

It is an amenable number.

77391327133 is a deficient number, since it is larger than the sum of its proper divisors (427576575).

77391327133 is a wasteful number, since it uses less digits than its factorization.

77391327133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427576574.

The product of its digits is 500094, while the sum is 46.

The spelling of 77391327133 in words is "seventy-seven billion, three hundred ninety-one million, three hundred twenty-seven thousand, one hundred thirty-three".