68005511 has 16 divisors (see below), whose sum is σ = 80064768. Its totient is φ = 56548800.

The previous prime is 68005507. The next prime is 68005513. The reversal of 68005511 is 11550086.

It is not a de Polignac number, because 68005511 - 2² = 68005507 is a prime.

It is a super-2 number, since 2×68005511² = 9249499052742242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68005513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59996 + ... + 61118.

It is an arithmetic number, because the mean of its divisors is an integer number (5004048).

Almost surely, 2^68005511 is an apocalyptic number.

68005511 is a deficient number, since it is larger than the sum of its proper divisors (12059257).

68005511 is a wasteful number, since it uses less digits than its factorization.

68005511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 68005511 is about 8246.5453979227. The cubic root of 68005511 is about 408.1765363651.

Adding to 68005511 its reverse (11550086), we get a palindrome (79555597).

The spelling of 68005511 in words is "sixty-eight million, five thousand, five hundred eleven".