20661052225 has 12 divisors (see below), whose sum is σ = 27948769200. Its totient is φ = 15026219600.

The previous prime is 20661052213. The next prime is 20661052259. The reversal of 20661052225 is 52225016602.

It is a happy number.

It is not a de Polignac number, because 20661052225 - 2⁵ = 20661052193 is a prime.

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, 37565275 + ... + 37565824.

It is an arithmetic number, because the mean of its divisors is an integer number (2329064100).

Almost surely, 2^20661052225 is an apocalyptic number.

20661052225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20661052225 is a deficient number, since it is larger than the sum of its proper divisors (7287716975).

20661052225 is a wasteful number, since it uses less digits than its factorization.

20661052225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75131120 (or 75131115 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 20661052225 its reverse (52225016602), we get a palindrome (72886068827).

The spelling of 20661052225 in words is "twenty billion, six hundred sixty-one million, fifty-two thousand, two hundred twenty-five".