78481644187 has 2 divisors, whose sum is σ = 78481644188. Its totient is φ = 78481644186.

The previous prime is 78481644133. The next prime is 78481644209. The reversal of 78481644187 is 78144618487.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78481644187 - 2¹⁵ = 78481611419 is a prime.

It is not a weakly prime, because it can be changed into another prime (78482644187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39240822093 + 39240822094.

It is an arithmetic number, because the mean of its divisors is an integer number (39240822094).

Almost surely, 2^78481644187 is an apocalyptic number.

78481644187 is a deficient number, since it is larger than the sum of its proper divisors (1).

78481644187 is an equidigital number, since it uses as much as digits as its factorization.

78481644187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9633792, while the sum is 58.

The spelling of 78481644187 in words is "seventy-eight billion, four hundred eighty-one million, six hundred forty-four thousand, one hundred eighty-seven".