78383169779 has 2 divisors, whose sum is σ = 78383169780. Its totient is φ = 78383169778.

The previous prime is 78383169773. The next prime is 78383169803. The reversal of 78383169779 is 97796138387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78383169779 - 2²⁰ = 78382121203 is a prime.

It is a super-2 number, since 2×78383169779² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78383169773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39191584889 + 39191584890.

It is an arithmetic number, because the mean of its divisors is an integer number (39191584890).

Almost surely, 2^78383169779 is an apocalyptic number.

78383169779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78383169779 is an equidigital number, since it uses as much as digits as its factorization.

78383169779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 68.

The spelling of 78383169779 in words is "seventy-eight billion, three hundred eighty-three million, one hundred sixty-nine thousand, seven hundred seventy-nine".