681117826043 has 4 divisors (see below), whose sum is σ = 681367231128. Its totient is φ = 680868420960.

The previous prime is 681117826019. The next prime is 681117826063. The reversal of 681117826043 is 340628711186.

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 681117826043 - 2⁶ = 681117825979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681117826063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124698446 + ... + 124703907.

It is an arithmetic number, because the mean of its divisors is an integer number (170341807782).

Almost surely, 2^681117826043 is an apocalyptic number.

681117826043 is a deficient number, since it is larger than the sum of its proper divisors (249405085).

681117826043 is a wasteful number, since it uses less digits than its factorization.

681117826043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249405084.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 681117826043 in words is "six hundred eighty-one billion, one hundred seventeen million, eight hundred twenty-six thousand, forty-three".