78623938559 has 2 divisors, whose sum is σ = 78623938560. Its totient is φ = 78623938558.

The previous prime is 78623938483. The next prime is 78623938583. The reversal of 78623938559 is 95583932687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78623938559 - 2¹² = 78623934463 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78623938495 and 78623938504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78623938259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39311969279 + 39311969280.

It is an arithmetic number, because the mean of its divisors is an integer number (39311969280).

Almost surely, 2^78623938559 is an apocalyptic number.

78623938559 is a deficient number, since it is larger than the sum of its proper divisors (1).

78623938559 is an equidigital number, since it uses as much as digits as its factorization.

78623938559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97977600, while the sum is 65.

The spelling of 78623938559 in words is "seventy-eight billion, six hundred twenty-three million, nine hundred thirty-eight thousand, five hundred fifty-nine".