78040080427 has 2 divisors, whose sum is σ = 78040080428. Its totient is φ = 78040080426.

The previous prime is 78040080397. The next prime is 78040080487. The reversal of 78040080427 is 72408004087.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78040080427 - 2³¹ = 75892596779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78040080427.

It is not a weakly prime, because it can be changed into another prime (78040080487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39020040213 + 39020040214.

It is an arithmetic number, because the mean of its divisors is an integer number (39020040214).

Almost surely, 2^78040080427 is an apocalyptic number.

78040080427 is a deficient number, since it is larger than the sum of its proper divisors (1).

78040080427 is an equidigital number, since it uses as much as digits as its factorization.

78040080427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 40.

The spelling of 78040080427 in words is "seventy-eight billion, forty million, eighty thousand, four hundred twenty-seven".