78643650023 has 2 divisors, whose sum is σ = 78643650024. Its totient is φ = 78643650022.

The previous prime is 78643650011. The next prime is 78643650073. The reversal of 78643650023 is 32005634687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78643650023 - 2¹⁴ = 78643633639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78643650073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321825011 + 39321825012.

It is an arithmetic number, because the mean of its divisors is an integer number (39321825012).

Almost surely, 2^78643650023 is an apocalyptic number.

78643650023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643650023 is an equidigital number, since it uses as much as digits as its factorization.

78643650023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 78643650023 in words is "seventy-eight billion, six hundred forty-three million, six hundred fifty thousand, twenty-three".