10644340638 has 8 divisors (see below), whose sum is σ = 21288681288. Its totient is φ = 3548113544.

The previous prime is 10644340621. The next prime is 10644340649. The reversal of 10644340638 is 83604344601.

It is a happy number.

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

10644340638 is an admirable number.

It is a super-2 number, since 2×10644340638² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10644340596 and 10644340605.

It is a congruent number.

It is an unprimeable number.

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, 887028381 + ... + 887028392.

It is an arithmetic number, because the mean of its divisors is an integer number (2661085161).

Almost surely, 2^10644340638 is an apocalyptic number.

10644340638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10644340638 is a wasteful number, since it uses less digits than its factorization.

10644340638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774056778.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 10644340638 in words is "ten billion, six hundred forty-four million, three hundred forty thousand, six hundred thirty-eight".