20551065503 has 2 divisors, whose sum is σ = 20551065504. Its totient is φ = 20551065502.

The previous prime is 20551065487. The next prime is 20551065527. The reversal of 20551065503 is 30556015502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20551065503 - 2⁴ = 20551065487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20551065503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20551065203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275532751 + 10275532752.

It is an arithmetic number, because the mean of its divisors is an integer number (10275532752).

Almost surely, 2^20551065503 is an apocalyptic number.

20551065503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551065503 is an equidigital number, since it uses as much as digits as its factorization.

20551065503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 20551065503 in words is "twenty billion, five hundred fifty-one million, sixty-five thousand, five hundred three".