68438236646 has 32 divisors (see below), whose sum is σ = 112168058688. Its totient is φ = 31126193280.

The previous prime is 68438236637. The next prime is 68438236697. The reversal of 68438236646 is 64663283486.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 68438236591 and 68438236600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4121216 + ... + 4137788.

It is an arithmetic number, because the mean of its divisors is an integer number (3505251834).

Almost surely, 2^68438236646 is an apocalyptic number.

68438236646 is a deficient number, since it is larger than the sum of its proper divisors (43729822042).

68438236646 is a wasteful number, since it uses less digits than its factorization.

68438236646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18896.

The product of its digits is 23887872, while the sum is 56.

The spelling of 68438236646 in words is "sixty-eight billion, four hundred thirty-eight million, two hundred thirty-six thousand, six hundred forty-six".