78472338784171 has 2 divisors, whose sum is σ = 78472338784172. Its totient is φ = 78472338784170.

The previous prime is 78472338784153. The next prime is 78472338784193. The reversal of 78472338784171 is 17148783327487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78472338784171 - 2¹³ = 78472338775979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78472338784171.

It is not a weakly prime, because it can be changed into another prime (78472338784111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39236169392085 + 39236169392086.

It is an arithmetic number, because the mean of its divisors is an integer number (39236169392086).

Almost surely, 2^{78472338784171} is an apocalyptic number.

78472338784171 is a deficient number, since it is larger than the sum of its proper divisors (1).

78472338784171 is an equidigital number, since it uses as much as digits as its factorization.

78472338784171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 354041856, while the sum is 70.

The spelling of 78472338784171 in words is "seventy-eight trillion, four hundred seventy-two billion, three hundred thirty-eight million, seven hundred eighty-four thousand, one hundred seventy-one".