68218434651 has 16 divisors (see below), whose sum is σ = 95761059840. Its totient is φ = 43078177440.

The previous prime is 68218434623. The next prime is 68218434671. The reversal of 68218434651 is 15643481286.

It is not a de Polignac number, because 68218434651 - 2²³ = 68210046043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68218434651.

It is not an unprimeable number, because it can be changed into a prime (68218434601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258406 + ... + 450788.

It is an arithmetic number, because the mean of its divisors is an integer number (5985066240).

Almost surely, 2^68218434651 is an apocalyptic number.

68218434651 is a deficient number, since it is larger than the sum of its proper divisors (27542625189).

68218434651 is a wasteful number, since it uses less digits than its factorization.

68218434651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198626.

The product of its digits is 1105920, while the sum is 48.

The spelling of 68218434651 in words is "sixty-eight billion, two hundred eighteen million, four hundred thirty-four thousand, six hundred fifty-one".