68136811449 has 128 divisors (see below), whose sum is σ = 117935308800. Its totient is φ = 34099211520.

The previous prime is 68136811417. The next prime is 68136811451. The reversal of 68136811449 is 94411863186.

It is not a de Polignac number, because 68136811449 - 2⁵ = 68136811417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68136811499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 33026992 + ... + 33029054.

It is an arithmetic number, because the mean of its divisors is an integer number (921369600).

Almost surely, 2^68136811449 is an apocalyptic number.

68136811449 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

68136811449 is a deficient number, since it is larger than the sum of its proper divisors (49798497351).

68136811449 is a wasteful number, since it uses less digits than its factorization.

68136811449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235.

The product of its digits is 995328, while the sum is 51.

The spelling of 68136811449 in words is "sixty-eight billion, one hundred thirty-six million, eight hundred eleven thousand, four hundred forty-nine".