77773235317 has 2 divisors, whose sum is σ = 77773235318. Its totient is φ = 77773235316.

The previous prime is 77773235297. The next prime is 77773235327. The reversal of 77773235317 is 71353237777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70918885636 + 6854349681 = 266306^2 + 82791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77773235317 is a prime.

It is a super-2 number, since 2×77773235317² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77773235327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38886617658 + 38886617659.

It is an arithmetic number, because the mean of its divisors is an integer number (38886617659).

Almost surely, 2^77773235317 is an apocalyptic number.

It is an amenable number.

77773235317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77773235317 is an equidigital number, since it uses as much as digits as its factorization.

77773235317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4537890, while the sum is 52.

The spelling of 77773235317 in words is "seventy-seven billion, seven hundred seventy-three million, two hundred thirty-five thousand, three hundred seventeen".