20611225529 has 2 divisors, whose sum is σ = 20611225530. Its totient is φ = 20611225528.

The previous prime is 20611225489. The next prime is 20611225567. The reversal of 20611225529 is 92552211602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12155503504 + 8455722025 = 110252^2 + 91955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20611225529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20611221529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10305612764 + 10305612765.

It is an arithmetic number, because the mean of its divisors is an integer number (10305612765).

Almost surely, 2^20611225529 is an apocalyptic number.

It is an amenable number.

20611225529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20611225529 is an equidigital number, since it uses as much as digits as its factorization.

20611225529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 20611225529 in words is "twenty billion, six hundred eleven million, two hundred twenty-five thousand, five hundred twenty-nine".