16861870441 has 4 divisors (see below), whose sum is σ = 18158937412. Its totient is φ = 15564803472.

The previous prime is 16861870411. The next prime is 16861870457. The reversal of 16861870441 is 14407816861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1017354816 + 15844515625 = 31896^2 + 125875^2 .

It is a cyclic number.

It is not a de Polignac number, because 16861870441 - 2⁵ = 16861870409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16861870391 and 16861870400.

It is not an unprimeable number, because it can be changed into a prime (16861870411) 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, 648533466 + ... + 648533491.

It is an arithmetic number, because the mean of its divisors is an integer number (4539734353).

Almost surely, 2^16861870441 is an apocalyptic number.

It is an amenable number.

16861870441 is a deficient number, since it is larger than the sum of its proper divisors (1297066971).

16861870441 is a wasteful number, since it uses less digits than its factorization.

16861870441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297066970.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 16861870441 in words is "sixteen billion, eight hundred sixty-one million, eight hundred seventy thousand, four hundred forty-one".