77939673204829 has 2 divisors, whose sum is σ = 77939673204830. Its totient is φ = 77939673204828.

The previous prime is 77939673204787. The next prime is 77939673204889. The reversal of 77939673204829 is 92840237693977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65980318471929 + 11959354732900 = 8122827^2 + 3458230^2 .

It is a cyclic number.

It is not a de Polignac number, because 77939673204829 - 2⁹ = 77939673204317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77939673204889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38969836602414 + 38969836602415.

It is an arithmetic number, because the mean of its divisors is an integer number (38969836602415).

Almost surely, 2^{77939673204829} is an apocalyptic number.

It is an amenable number.

77939673204829 is a deficient number, since it is larger than the sum of its proper divisors (1).

77939673204829 is an equidigital number, since it uses as much as digits as its factorization.

77939673204829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728324864, while the sum is 76.

The spelling of 77939673204829 in words is "seventy-seven trillion, nine hundred thirty-nine billion, six hundred seventy-three million, two hundred four thousand, eight hundred twenty-nine".