78778462319 has 2 divisors, whose sum is σ = 78778462320. Its totient is φ = 78778462318.

The previous prime is 78778462303. The next prime is 78778462339. The reversal of 78778462319 is 91326487787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78778462319 - 2⁴ = 78778462303 is a prime.

It is a super-2 number, since 2×78778462319² (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 (78778462339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39389231159 + 39389231160.

It is an arithmetic number, because the mean of its divisors is an integer number (39389231160).

Almost surely, 2^78778462319 is an apocalyptic number.

78778462319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78778462319 is an equidigital number, since it uses as much as digits as its factorization.

78778462319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28449792, while the sum is 62.

The spelling of 78778462319 in words is "seventy-eight billion, seven hundred seventy-eight million, four hundred sixty-two thousand, three hundred nineteen".