78571880171 has 2 divisors, whose sum is σ = 78571880172. Its totient is φ = 78571880170.

The previous prime is 78571880131. The next prime is 78571880203. The reversal of 78571880171 is 17108817587.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78571880171 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78571880131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39285940085 + 39285940086.

It is an arithmetic number, because the mean of its divisors is an integer number (39285940086).

Almost surely, 2^78571880171 is an apocalyptic number.

78571880171 is a deficient number, since it is larger than the sum of its proper divisors (1).

78571880171 is an equidigital number, since it uses as much as digits as its factorization.

78571880171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 878080, while the sum is 53.

The spelling of 78571880171 in words is "seventy-eight billion, five hundred seventy-one million, eight hundred eighty thousand, one hundred seventy-one".