78486188971 has 2 divisors, whose sum is σ = 78486188972. Its totient is φ = 78486188970.

The previous prime is 78486188941. The next prime is 78486189011. The reversal of 78486188971 is 17988168487.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78486188971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78486188897 and 78486188906.

It is not a weakly prime, because it can be changed into another prime (78486188941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39243094485 + 39243094486.

It is an arithmetic number, because the mean of its divisors is an integer number (39243094486).

Almost surely, 2^78486188971 is an apocalyptic number.

78486188971 is a deficient number, since it is larger than the sum of its proper divisors (1).

78486188971 is an equidigital number, since it uses as much as digits as its factorization.

78486188971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 67.

The spelling of 78486188971 in words is "seventy-eight billion, four hundred eighty-six million, one hundred eighty-eight thousand, nine hundred seventy-one".