10661665225 has 12 divisors (see below), whose sum is σ = 13916279440. Its totient is φ = 8080419600.

The previous prime is 10661665219. The next prime is 10661665291. The reversal of 10661665225 is 52256616601.

It is not a de Polignac number, because 10661665225 - 2¹³ = 10661657033 is a prime.

It is a super-2 number, since 2×10661665225² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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 in 11 ways as a sum of consecutive naturals, for example, 11222331 + ... + 11223280.

Almost surely, 2^10661665225 is an apocalyptic number.

It is an amenable number.

10661665225 is a deficient number, since it is larger than the sum of its proper divisors (3254614215).

10661665225 is a wasteful number, since it uses less digits than its factorization.

10661665225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22445640 (or 22445635 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 10661665225 in words is "ten billion, six hundred sixty-one million, six hundred sixty-five thousand, two hundred twenty-five".