77638884923 has 2 divisors, whose sum is σ = 77638884924. Its totient is φ = 77638884922.

The previous prime is 77638884907. The next prime is 77638884977. The reversal of 77638884923 is 32948883677.

It is a weak prime.

It is an emirp because it is prime and its reverse (32948883677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77638884923 - 2⁴ = 77638884907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77638884923.

It is not a weakly prime, because it can be changed into another prime (77638884623) 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 as a sum of consecutive naturals, namely, 38819442461 + 38819442462.

It is an arithmetic number, because the mean of its divisors is an integer number (38819442462).

Almost surely, 2^77638884923 is an apocalyptic number.

77638884923 is a deficient number, since it is larger than the sum of its proper divisors (1).

77638884923 is an equidigital number, since it uses as much as digits as its factorization.

77638884923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97542144, while the sum is 65.

The spelling of 77638884923 in words is "seventy-seven billion, six hundred thirty-eight million, eight hundred eighty-four thousand, nine hundred twenty-three".