68172405647 has 2 divisors, whose sum is σ = 68172405648. Its totient is φ = 68172405646.

The previous prime is 68172405611. The next prime is 68172405659. The reversal of 68172405647 is 74650427186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68172405647 - 2¹⁶ = 68172340111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68172405595 and 68172405604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68172405607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34086202823 + 34086202824.

It is an arithmetic number, because the mean of its divisors is an integer number (34086202824).

Almost surely, 2^68172405647 is an apocalyptic number.

68172405647 is a deficient number, since it is larger than the sum of its proper divisors (1).

68172405647 is an equidigital number, since it uses as much as digits as its factorization.

68172405647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 68172405647 in words is "sixty-eight billion, one hundred seventy-two million, four hundred five thousand, six hundred forty-seven".