68642851 has 4 divisors (see below), whose sum is σ = 68711104. Its totient is φ = 68574600.

The previous prime is 68642843. The next prime is 68642857. The reversal of 68642851 is 15824686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15824686 = 2 ⋅7912343.

It is a cyclic number.

It is not a de Polignac number, because 68642851 - 2³ = 68642843 is a prime.

It is a super-3 number, since 3×68642851³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68642857) 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, 32595 + ... + 34636.

It is an arithmetic number, because the mean of its divisors is an integer number (17177776).

Almost surely, 2^68642851 is an apocalyptic number.

68642851 is a deficient number, since it is larger than the sum of its proper divisors (68253).

68642851 is a wasteful number, since it uses less digits than its factorization.

68642851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68252.

The product of its digits is 92160, while the sum is 40.

The square root of 68642851 is about 8285.0981285679. The cubic root of 68642851 is about 409.4477017200.

The spelling of 68642851 in words is "sixty-eight million, six hundred forty-two thousand, eight hundred fifty-one".