20661411225 has 96 divisors (see below), whose sum is σ = 42117304320. Its totient is φ = 8703325440.

The previous prime is 20661411223. The next prime is 20661411257. The reversal of 20661411225 is 52211416602.

It is not a de Polignac number, because 20661411225 - 2¹ = 20661411223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20661411192 and 20661411201.

It is not an unprimeable number, because it can be changed into a prime (20661411223) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 4413436 + ... + 4418114.

It is an arithmetic number, because the mean of its divisors is an integer number (438721920).

Almost surely, 2^20661411225 is an apocalyptic number.

20661411225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20661411225 is an abundant number, since it is smaller than the sum of its proper divisors (21455893095).

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

20661411225 is a wasteful number, since it uses less digits than its factorization.

20661411225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5359 (or 5354 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 20661411225 its reverse (52211416602), we get a palindrome (72872827827).

The spelling of 20661411225 in words is "twenty billion, six hundred sixty-one million, four hundred eleven thousand, two hundred twenty-five".