68218051 has 4 divisors (see below), whose sum is σ = 74419704. Its totient is φ = 62016400.

The previous prime is 68218027. The next prime is 68218061. The reversal of 68218051 is 15081286.

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 68218051 - 2⁵ = 68218019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68218021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100810 + ... + 3100831.

It is an arithmetic number, because the mean of its divisors is an integer number (18604926).

Almost surely, 2^68218051 is an apocalyptic number.

68218051 is a deficient number, since it is larger than the sum of its proper divisors (6201653).

68218051 is a wasteful number, since it uses less digits than its factorization.

68218051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6201652.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 68218051 is about 8259.4219531393. The cubic root of 68218051 is about 408.6013236021.

The spelling of 68218051 in words is "sixty-eight million, two hundred eighteen thousand, fifty-one".