10661559556 has 48 divisors (see below), whose sum is σ = 19535040000. Its totient is φ = 5085400320.

The previous prime is 10661559551. The next prime is 10661559563. The reversal of 10661559556 is 65595516601.

It is a happy number.

It is a super-2 number, since 2×10661559556² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661559551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4181370 + ... + 4183918.

It is an arithmetic number, because the mean of its divisors is an integer number (406980000).

Almost surely, 2^10661559556 is an apocalyptic number.

It is an amenable number.

10661559556 is a deficient number, since it is larger than the sum of its proper divisors (8873480444).

10661559556 is a wasteful number, since it uses less digits than its factorization.

10661559556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3050 counting only the distinct ones).

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 10661559556 in words is "ten billion, six hundred sixty-one million, five hundred fifty-nine thousand, five hundred fifty-six".