10681645987 has 4 divisors (see below), whose sum is σ = 10735322800. Its totient is φ = 10627969176.

The previous prime is 10681645979. The next prime is 10681646021. The reversal of 10681645987 is 78954618601.

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 10681645987 - 2³ = 10681645979 is a prime.

It is a super-2 number, since 2×10681645987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10681645937) 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, 26838108 + ... + 26838505.

It is an arithmetic number, because the mean of its divisors is an integer number (2683830700).

Almost surely, 2^10681645987 is an apocalyptic number.

10681645987 is a deficient number, since it is larger than the sum of its proper divisors (53676813).

10681645987 is an equidigital number, since it uses as much as digits as its factorization.

10681645987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53676812.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 10681645987 in words is "ten billion, six hundred eighty-one million, six hundred forty-five thousand, nine hundred eighty-seven".