77912179443 has 24 divisors (see below), whose sum is σ = 136182634848. Its totient is φ = 41902348032.

The previous prime is 77912179421. The next prime is 77912179463. The reversal of 77912179443 is 34497121977.

It is a happy number.

77912179443 is a `hidden beast` number, since 7 + 7 + 9 + 121 + 79 + 443 = 666.

It is not a de Polignac number, because 77912179443 - 2⁹ = 77912178931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77912179443.

It is not an unprimeable number, because it can be changed into a prime (77912179463) 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 23 ways as a sum of consecutive naturals, for example, 36372496 + ... + 36374637.

It is an arithmetic number, because the mean of its divisors is an integer number (5674276452).

Almost surely, 2^77912179443 is an apocalyptic number.

77912179443 is a deficient number, since it is larger than the sum of its proper divisors (58270455405).

77912179443 is a wasteful number, since it uses less digits than its factorization.

77912179443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72747163 (or 72747160 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 77912179443 in words is "seventy-seven billion, nine hundred twelve million, one hundred seventy-nine thousand, four hundred forty-three".