68071511 has 4 divisors (see below), whose sum is σ = 68165112. Its totient is φ = 67977912.

The previous prime is 68071489. The next prime is 68071583. The reversal of 68071511 is 11517086.

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 68071511 - 2⁶ = 68071447 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 (68077511) 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, 45701 + ... + 47166.

It is an arithmetic number, because the mean of its divisors is an integer number (17041278).

Almost surely, 2^68071511 is an apocalyptic number.

68071511 is a deficient number, since it is larger than the sum of its proper divisors (93601).

68071511 is an equidigital number, since it uses as much as digits as its factorization.

68071511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93600.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 68071511 is about 8250.5461031377. The cubic root of 68071511 is about 408.3085400838.

Adding to 68071511 its reverse (11517086), we get a palindrome (79588597).

The spelling of 68071511 in words is "sixty-eight million, seventy-one thousand, five hundred eleven".