10661212242 has 18 divisors (see below), whose sum is σ = 23100242373. Its totient is φ = 3553591392.

The previous prime is 10661212213. The next prime is 10661212273. The reversal of 10661212242 is 24221216601.

10661212242 is a `hidden beast` number, since 1 + 0 + 6 + 612 + 1 + 2 + 2 + 42 = 666.

10661212242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5467271481 + 5193940761 = 73941^2 + 72069^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=73011.

It is a super-2 number, since 2×10661212242² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 425898 + ... + 450234.

Almost surely, 2^10661212242 is an apocalyptic number.

10661212242 is an abundant number, since it is smaller than the sum of its proper divisors (12439030131).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10661212242 is an frugal number, since it uses more digits than its factorization.

10661212242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48682 (or 24342 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 10661212242 its reverse (24221216601), we get a palindrome (34882428843).

The spelling of 10661212242 in words is "ten billion, six hundred sixty-one million, two hundred twelve thousand, two hundred forty-two".