10661555552 has 12 divisors (see below), whose sum is σ = 20989937556. Its totient is φ = 5330777760.

The previous prime is 10661555549. The next prime is 10661555561. The reversal of 10661555552 is 25555516601.

It is a happy number.

It is a super-2 number, since 2×10661555552² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 166586774 + ... + 166586837.

It is an arithmetic number, because the mean of its divisors is an integer number (1749161463).

Almost surely, 2^10661555552 is an apocalyptic number.

It is an amenable number.

10661555552 is a deficient number, since it is larger than the sum of its proper divisors (10328382004).

10661555552 is an equidigital number, since it uses as much as digits as its factorization.

10661555552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333173621 (or 333173613 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 10661555552 in words is "ten billion, six hundred sixty-one million, five hundred fifty-five thousand, five hundred fifty-two".