68143511 has 4 divisors (see below), whose sum is σ = 68601000. Its totient is φ = 67686024.

The previous prime is 68143483. The next prime is 68143547. The reversal of 68143511 is 11534186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11534186 = 2 ⋅5767093.

It is a cyclic number.

It is not a de Polignac number, because 68143511 - 2⁶ = 68143447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68143111) 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, 228521 + ... + 228818.

It is an arithmetic number, because the mean of its divisors is an integer number (17150250).

Almost surely, 2^68143511 is an apocalyptic number.

68143511 is a deficient number, since it is larger than the sum of its proper divisors (457489).

68143511 is a wasteful number, since it uses less digits than its factorization.

68143511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457488.

The product of its digits is 2880, while the sum is 29.

The square root of 68143511 is about 8254.9082974919. The cubic root of 68143511 is about 408.4524468646.

Adding to 68143511 its reverse (11534186), we get a palindrome (79677697).

The spelling of 68143511 in words is "sixty-eight million, one hundred forty-three thousand, five hundred eleven".