10661555553 has 16 divisors (see below), whose sum is σ = 15530455296. Its totient is φ = 6452074640.

The previous prime is 10661555549. The next prime is 10661555561. The reversal of 10661555553 is 35555516601.

It is a happy number.

It is not a de Polignac number, because 10661555553 - 2² = 10661555549 is a prime.

It is a super-2 number, since 2×10661555553² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661555533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213975 + ... + 259052.

It is an arithmetic number, because the mean of its divisors is an integer number (970653456).

Almost surely, 2^10661555553 is an apocalyptic number.

It is an amenable number.

10661555553 is a deficient number, since it is larger than the sum of its proper divisors (4868899743).

10661555553 is a wasteful number, since it uses less digits than its factorization.

10661555553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473724.

The product of its (nonzero) digits is 337500, while the sum is 42.

The spelling of 10661555553 in words is "ten billion, six hundred sixty-one million, five hundred fifty-five thousand, five hundred fifty-three".