10556866591 has 18 divisors (see below), whose sum is σ = 10992395400. Its totient is φ = 10138407840.

The previous prime is 10556866589. The next prime is 10556866609. The reversal of 10556866591 is 19566865501.

It is not a de Polignac number, because 10556866591 - 2¹ = 10556866589 is a prime.

It is a super-2 number, since 2×10556866591² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10556866291) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7545310 + ... + 7546708.

Almost surely, 2^10556866591 is an apocalyptic number.

10556866591 is a deficient number, since it is larger than the sum of its proper divisors (435528809).

10556866591 is an frugal number, since it uses more digits than its factorization.

10556866591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 10556866591 in words is "ten billion, five hundred fifty-six million, eight hundred sixty-six thousand, five hundred ninety-one".