68451993651 has 16 divisors (see below), whose sum is σ = 95251288320. Its totient is φ = 43644252960.

The previous prime is 68451993641. The next prime is 68451993679. The reversal of 68451993651 is 15639915486.

It is not a de Polignac number, because 68451993651 - 2¹⁴ = 68451977267 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68451993591 and 68451993600.

It is not an unprimeable number, because it can be changed into a prime (68451993601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436456 + ... + 572186.

It is an arithmetic number, because the mean of its divisors is an integer number (5953205520).

Almost surely, 2^68451993651 is an apocalyptic number.

68451993651 is a deficient number, since it is larger than the sum of its proper divisors (26799294669).

68451993651 is a wasteful number, since it uses less digits than its factorization.

68451993651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143066.

The product of its digits is 6998400, while the sum is 57.

The spelling of 68451993651 in words is "sixty-eight billion, four hundred fifty-one million, nine hundred ninety-three thousand, six hundred fifty-one".