77939486369 has 2 divisors, whose sum is σ = 77939486370. Its totient is φ = 77939486368.

The previous prime is 77939486333. The next prime is 77939486371. The reversal of 77939486369 is 96368493977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63573066769 + 14366419600 = 252137^2 + 119860^2 .

It is a cyclic number.

It is not a de Polignac number, because 77939486369 - 2³² = 73644519073 is a prime.

It is a super-3 number, since 3×77939486369³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 77939486371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77939486309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38969743184 + 38969743185.

It is an arithmetic number, because the mean of its divisors is an integer number (38969743185).

Almost surely, 2^77939486369 is an apocalyptic number.

It is an amenable number.

77939486369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77939486369 is an equidigital number, since it uses as much as digits as its factorization.

77939486369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370355328, while the sum is 71.

The spelling of 77939486369 in words is "seventy-seven billion, nine hundred thirty-nine million, four hundred eighty-six thousand, three hundred sixty-nine".