10861878917 has 4 divisors (see below), whose sum is σ = 10906949196. Its totient is φ = 10816808640.

The previous prime is 10861878857. The next prime is 10861878931. The reversal of 10861878917 is 71987816801.

10861878917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71987816801 = 251 ⋅286804051.

It can be written as a sum of positive squares in 2 ways, for example, as 7657300036 + 3204578881 = 87506^2 + 56609^2 .

It is a cyclic number.

It is not a de Polignac number, because 10861878917 - 2⁸ = 10861878661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10861878947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22534778 + ... + 22535259.

It is an arithmetic number, because the mean of its divisors is an integer number (2726737299).

Almost surely, 2^10861878917 is an apocalyptic number.

It is an amenable number.

10861878917 is a deficient number, since it is larger than the sum of its proper divisors (45070279).

10861878917 is an equidigital number, since it uses as much as digits as its factorization.

10861878917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45070278.

The product of its (nonzero) digits is 1354752, while the sum is 56.

The spelling of 10861878917 in words is "ten billion, eight hundred sixty-one million, eight hundred seventy-eight thousand, nine hundred seventeen".