68381563 has 4 divisors (see below), whose sum is σ = 70049448. Its totient is φ = 66713680.

The previous prime is 68381557. The next prime is 68381603. The reversal of 68381563 is 36518386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36518386 = 2 ⋅18259193.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68381563 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68381543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833881 + ... + 833962.

It is an arithmetic number, because the mean of its divisors is an integer number (17512362).

Almost surely, 2^68381563 is an apocalyptic number.

68381563 is a deficient number, since it is larger than the sum of its proper divisors (1667885).

68381563 is a wasteful number, since it uses less digits than its factorization.

68381563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667884.

The product of its digits is 103680, while the sum is 40.

The square root of 68381563 is about 8269.3145423306. The cubic root of 68381563 is about 408.9275222628.

The spelling of 68381563 in words is "sixty-eight million, three hundred eighty-one thousand, five hundred sixty-three".