78019619449 has 2 divisors, whose sum is σ = 78019619450. Its totient is φ = 78019619448.

The previous prime is 78019619437. The next prime is 78019619467. The reversal of 78019619449 is 94491691087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66477340224 + 11542279225 = 257832^2 + 107435^2 .

It is an emirp because it is prime and its reverse (94491691087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78019619449 - 2²³ = 78011230841 is a prime.

It is a super-2 number, since 2×78019619449² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78019619393 and 78019619402.

It is not a weakly prime, because it can be changed into another prime (78019619479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39009809724 + 39009809725.

It is an arithmetic number, because the mean of its divisors is an integer number (39009809725).

Almost surely, 2^78019619449 is an apocalyptic number.

It is an amenable number.

78019619449 is a deficient number, since it is larger than the sum of its proper divisors (1).

78019619449 is an equidigital number, since it uses as much as digits as its factorization.

78019619449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 78019619449 in words is "seventy-eight billion, nineteen million, six hundred nineteen thousand, four hundred forty-nine".