68361511 has 4 divisors (see below), whose sum is σ = 68383224. Its totient is φ = 68339800.

The previous prime is 68361509. The next prime is 68361521. The reversal of 68361511 is 11516386.

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 68361511 - 2¹ = 68361509 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 (68361521) 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, 5125 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (17095806).

Almost surely, 2^68361511 is an apocalyptic number.

68361511 is a deficient number, since it is larger than the sum of its proper divisors (21713).

68361511 is a wasteful number, since it uses less digits than its factorization.

68361511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21712.

The product of its digits is 4320, while the sum is 31.

The square root of 68361511 is about 8268.1020192061. The cubic root of 68361511 is about 408.8875474706.

Adding to 68361511 its reverse (11516386), we get a palindrome (79877897).

The spelling of 68361511 in words is "sixty-eight million, three hundred sixty-one thousand, five hundred eleven".