78541314409 has 2 divisors, whose sum is σ = 78541314410. Its totient is φ = 78541314408.

The previous prime is 78541314407. The next prime is 78541314419. The reversal of 78541314409 is 90441314587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48309842025 + 30231472384 = 219795^2 + 173872^2 .

It is a cyclic number.

It is not a de Polignac number, because 78541314409 - 2¹ = 78541314407 is a prime.

Together with 78541314407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78541314403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39270657204 + 39270657205.

It is an arithmetic number, because the mean of its divisors is an integer number (39270657205).

Almost surely, 2^78541314409 is an apocalyptic number.

It is an amenable number.

78541314409 is a deficient number, since it is larger than the sum of its proper divisors (1).

78541314409 is an equidigital number, since it uses as much as digits as its factorization.

78541314409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 78541314409 in words is "seventy-eight billion, five hundred forty-one million, three hundred fourteen thousand, four hundred nine".