77745171893 has 2 divisors, whose sum is σ = 77745171894. Its totient is φ = 77745171892.

The previous prime is 77745171883. The next prime is 77745171929. The reversal of 77745171893 is 39817154777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74279141764 + 3466030129 = 272542^2 + 58873^2 .

It is an emirp because it is prime and its reverse (39817154777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77745171893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77745171883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38872585946 + 38872585947.

It is an arithmetic number, because the mean of its divisors is an integer number (38872585947).

Almost surely, 2^77745171893 is an apocalyptic number.

It is an amenable number.

77745171893 is a deficient number, since it is larger than the sum of its proper divisors (1).

77745171893 is an equidigital number, since it uses as much as digits as its factorization.

77745171893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10372320, while the sum is 59.

The spelling of 77745171893 in words is "seventy-seven billion, seven hundred forty-five million, one hundred seventy-one thousand, eight hundred ninety-three".