78643650011 has 2 divisors, whose sum is σ = 78643650012. Its totient is φ = 78643650010.

The previous prime is 78643649993. The next prime is 78643650023. The reversal of 78643650011 is 11005634687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78643650011 - 2⁶ = 78643649947 is a prime.

It is not a weakly prime, because it can be changed into another prime (78643650091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321825005 + 39321825006.

It is an arithmetic number, because the mean of its divisors is an integer number (39321825006).

Almost surely, 2^78643650011 is an apocalyptic number.

78643650011 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643650011 is an equidigital number, since it uses as much as digits as its factorization.

78643650011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 78643650011 in words is "seventy-eight billion, six hundred forty-three million, six hundred fifty thousand, eleven".