78734869663 has 2 divisors, whose sum is σ = 78734869664. Its totient is φ = 78734869662.

The previous prime is 78734869649. The next prime is 78734869711. The reversal of 78734869663 is 36696843787.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78734869663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78734860663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367434831 + 39367434832.

It is an arithmetic number, because the mean of its divisors is an integer number (39367434832).

Almost surely, 2^78734869663 is an apocalyptic number.

78734869663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734869663 is an equidigital number, since it uses as much as digits as its factorization.

78734869663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219469824, while the sum is 67.

The spelling of 78734869663 in words is "seventy-eight billion, seven hundred thirty-four million, eight hundred sixty-nine thousand, six hundred sixty-three".