201505565803 has 2 divisors, whose sum is σ = 201505565804. Its totient is φ = 201505565802.

The previous prime is 201505565699. The next prime is 201505565819. The reversal of 201505565803 is 308565505102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201505565803 - 2¹⁷ = 201505434731 is a prime.

It is not a weakly prime, because it can be changed into another prime (201505566803) 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, 100752782901 + 100752782902.

It is an arithmetic number, because the mean of its divisors is an integer number (100752782902).

Almost surely, 2^201505565803 is an apocalyptic number.

201505565803 is a deficient number, since it is larger than the sum of its proper divisors (1).

201505565803 is an equidigital number, since it uses as much as digits as its factorization.

201505565803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 201505565803 in words is "two hundred one billion, five hundred five million, five hundred sixty-five thousand, eight hundred three".