77454842117 has 2 divisors, whose sum is σ = 77454842118. Its totient is φ = 77454842116.

The previous prime is 77454842011. The next prime is 77454842123. The reversal of 77454842117 is 71124845477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77212292641 + 242549476 = 277871^2 + 15574^2 .

It is a cyclic number.

It is not a de Polignac number, because 77454842117 - 2⁸ = 77454841861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77454842197) 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, 38727421058 + 38727421059.

It is an arithmetic number, because the mean of its divisors is an integer number (38727421059).

Almost surely, 2^77454842117 is an apocalyptic number.

It is an amenable number.

77454842117 is a deficient number, since it is larger than the sum of its proper divisors (1).

77454842117 is an equidigital number, since it uses as much as digits as its factorization.

77454842117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1756160, while the sum is 50.

The spelling of 77454842117 in words is "seventy-seven billion, four hundred fifty-four million, eight hundred forty-two thousand, one hundred seventeen".