681852851899633 has 4 divisors (see below), whose sum is σ = 681870709435968. Its totient is φ = 681834994363300.

The previous prime is 681852851899603. The next prime is 681852851899691. The reversal of 681852851899633 is 336998158258186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681852851899633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681852851899603) 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 3 ways as a sum of consecutive naturals, for example, 8928710893 + ... + 8928787258.

It is an arithmetic number, because the mean of its divisors is an integer number (170467677358992).

Almost surely, 2^{681852851899633} is an apocalyptic number.

It is an amenable number.

681852851899633 is a deficient number, since it is larger than the sum of its proper divisors (17857536335).

681852851899633 is a wasteful number, since it uses less digits than its factorization.

681852851899633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17857536334.

The product of its digits is 5374771200, while the sum is 82.

The spelling of 681852851899633 in words is "six hundred eighty-one trillion, eight hundred fifty-two billion, eight hundred fifty-one million, eight hundred ninety-nine thousand, six hundred thirty-three".