20501233553 has 2 divisors, whose sum is σ = 20501233554. Its totient is φ = 20501233552.

The previous prime is 20501233547. The next prime is 20501233559. The reversal of 20501233553 is 35533210502.

It is a balanced prime because it is at equal distance from previous prime (20501233547) and next prime (20501233559).

It can be written as a sum of positive squares in only one way, i.e., 20496789889 + 4443664 = 143167^2 + 2108^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501233553 - 2¹⁰ = 20501232529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20501233559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250616776 + 10250616777.

It is an arithmetic number, because the mean of its divisors is an integer number (10250616777).

Almost surely, 2^20501233553 is an apocalyptic number.

It is an amenable number.

20501233553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501233553 is an equidigital number, since it uses as much as digits as its factorization.

20501233553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 29.

The spelling of 20501233553 in words is "twenty billion, five hundred one million, two hundred thirty-three thousand, five hundred fifty-three".