20501164553 has 2 divisors, whose sum is σ = 20501164554. Its totient is φ = 20501164552.

The previous prime is 20501164529. The next prime is 20501164591. The reversal of 20501164553 is 35546110502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19693070224 + 808094329 = 140332^2 + 28427^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501164553 - 2¹⁴ = 20501148169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20501164513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250582276 + 10250582277.

It is an arithmetic number, because the mean of its divisors is an integer number (10250582277).

Almost surely, 2^20501164553 is an apocalyptic number.

It is an amenable number.

20501164553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501164553 is an equidigital number, since it uses as much as digits as its factorization.

20501164553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 20501164553 in words is "twenty billion, five hundred one million, one hundred sixty-four thousand, five hundred fifty-three".