68016251 has 4 divisors (see below), whose sum is σ = 68052600. Its totient is φ = 67979904.

The previous prime is 68016211. The next prime is 68016283. The reversal of 68016251 is 15261086.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68016251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68016211) 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, 15206 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (17013150).

Almost surely, 2^68016251 is an apocalyptic number.

68016251 is a deficient number, since it is larger than the sum of its proper divisors (36349).

68016251 is a wasteful number, since it uses less digits than its factorization.

68016251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36348.

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

The square root of 68016251 is about 8247.1965539812. The cubic root of 68016251 is about 408.1980227867.

The spelling of 68016251 in words is "sixty-eight million, sixteen thousand, two hundred fifty-one".