10661443605 has 12 divisors (see below), whose sum is σ = 18479835660. Its totient is φ = 5686103232.

The previous prime is 10661443603. The next prime is 10661443619. The reversal of 10661443605 is 50634416601.

It is a happy number.

10661443605 is a `hidden beast` number, since 1 + 0 + 6 + 6 + 1 + 4 + 43 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4912467921 + 5748975684 = 70089^2 + 75822^2 .

It is not a de Polignac number, because 10661443605 - 2¹ = 10661443603 is a prime.

It is a super-2 number, since 2×10661443605² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10661443605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661443603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118460440 + ... + 118460529.

It is an arithmetic number, because the mean of its divisors is an integer number (1539986305).

Almost surely, 2^10661443605 is an apocalyptic number.

10661443605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10661443605 is a deficient number, since it is larger than the sum of its proper divisors (7818392055).

10661443605 is a wasteful number, since it uses less digits than its factorization.

10661443605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236920980 (or 236920977 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 10661443605 in words is "ten billion, six hundred sixty-one million, four hundred forty-three thousand, six hundred five".