20511606523 has 2 divisors, whose sum is σ = 20511606524. Its totient is φ = 20511606522.

The previous prime is 20511606469. The next prime is 20511606553. The reversal of 20511606523 is 32560611502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20511606523 - 2²⁹ = 19974735611 is a prime.

It is a super-3 number, since 3×20511606523³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20511606553) by changing a digit.

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 as a sum of consecutive naturals, namely, 10255803261 + 10255803262.

It is an arithmetic number, because the mean of its divisors is an integer number (10255803262).

Almost surely, 2^20511606523 is an apocalyptic number.

20511606523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511606523 is an equidigital number, since it uses as much as digits as its factorization.

20511606523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20511606523 in words is "twenty billion, five hundred eleven million, six hundred six thousand, five hundred twenty-three".