68511693 has 4 divisors (see below), whose sum is σ = 91348928. Its totient is φ = 45674460.

The previous prime is 68511689. The next prime is 68511731. The reversal of 68511693 is 39611586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68511693 - 2² = 68511689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68511613) 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, 11418613 + ... + 11418618.

It is an arithmetic number, because the mean of its divisors is an integer number (22837232).

Almost surely, 2^68511693 is an apocalyptic number.

It is an amenable number.

68511693 is a deficient number, since it is larger than the sum of its proper divisors (22837235).

68511693 is a wasteful number, since it uses less digits than its factorization.

68511693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22837234.

The product of its digits is 38880, while the sum is 39.

The square root of 68511693 is about 8277.1790484440. The cubic root of 68511693 is about 409.1867540233.

The spelling of 68511693 in words is "sixty-eight million, five hundred eleven thousand, six hundred ninety-three".