10939644857 has 8 divisors (see below), whose sum is σ = 11982573000. Its totient is φ = 9941096704.

The previous prime is 10939644841. The next prime is 10939644883. The reversal of 10939644857 is 75844693901.

It can be written as a sum of positive squares in 4 ways, for example, as 4008915856 + 6930729001 = 63316^2 + 83251^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 10939644857 - 2⁴ = 10939644841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10939644557) 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, 11094482 + ... + 11095467.

It is an arithmetic number, because the mean of its divisors is an integer number (1497821625).

Almost surely, 2^10939644857 is an apocalyptic number.

10939644857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

10939644857 is a deficient number, since it is larger than the sum of its proper divisors (1042928143).

10939644857 is a wasteful number, since it uses less digits than its factorization.

10939644857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22189995.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 10939644857 in words is "ten billion, nine hundred thirty-nine million, six hundred forty-four thousand, eight hundred fifty-seven".