68218503 has 4 divisors (see below), whose sum is σ = 90958008. Its totient is φ = 45479000.

The previous prime is 68218499. The next prime is 68218517. The reversal of 68218503 is 30581286.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68218503 - 2² = 68218499 is a prime.

It is a super-2 number, since 2×68218503² = 9307528303122018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68218523) 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, 11369748 + ... + 11369753.

It is an arithmetic number, because the mean of its divisors is an integer number (22739502).

Almost surely, 2^68218503 is an apocalyptic number.

68218503 is a deficient number, since it is larger than the sum of its proper divisors (22739505).

68218503 is a wasteful number, since it uses less digits than its factorization.

68218503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22739504.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 68218503 is about 8259.4493157837. The cubic root of 68218503 is about 408.6022260387.

Adding to 68218503 its reverse (30581286), we get a palindrome (98799789).

The spelling of 68218503 in words is "sixty-eight million, two hundred eighteen thousand, five hundred three".