681533952449 has 8 divisors (see below), whose sum is σ = 824713354368. Its totient is φ = 549808902720.

The previous prime is 681533952427. The next prime is 681533952523. The reversal of 681533952449 is 944259335186.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681533952449 - 2²⁸ = 681265516993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681533952419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863587917 + ... + 2863588154.

It is an arithmetic number, because the mean of its divisors is an integer number (103089169296).

Almost surely, 2^681533952449 is an apocalyptic number.

It is an amenable number.

681533952449 is a deficient number, since it is larger than the sum of its proper divisors (143179401919).

681533952449 is a wasteful number, since it uses less digits than its factorization.

681533952449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5727176095.

The product of its digits is 27993600, while the sum is 59.

The spelling of 681533952449 in words is "six hundred eighty-one billion, five hundred thirty-three million, nine hundred fifty-two thousand, four hundred forty-nine".