77957694673 has 2 divisors, whose sum is σ = 77957694674. Its totient is φ = 77957694672.

The previous prime is 77957694671. The next prime is 77957694691. The reversal of 77957694673 is 37649675977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76070052864 + 1887641809 = 275808^2 + 43447^2 .

It is an emirp because it is prime and its reverse (37649675977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77957694673 - 2¹ = 77957694671 is a prime.

Together with 77957694671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77957694671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38978847336 + 38978847337.

It is an arithmetic number, because the mean of its divisors is an integer number (38978847337).

Almost surely, 2^77957694673 is an apocalyptic number.

It is an amenable number.

77957694673 is a deficient number, since it is larger than the sum of its proper divisors (1).

77957694673 is an equidigital number, since it uses as much as digits as its factorization.

77957694673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420078960, while the sum is 70.

The spelling of 77957694673 in words is "seventy-seven billion, nine hundred fifty-seven million, six hundred ninety-four thousand, six hundred seventy-three".