201505561603 has 2 divisors, whose sum is σ = 201505561604. Its totient is φ = 201505561602.

The previous prime is 201505561597. The next prime is 201505561619. The reversal of 201505561603 is 306165505102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201505561603 is a prime.

It is not a weakly prime, because it can be changed into another prime (201505561693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100752780801 + 100752780802.

It is an arithmetic number, because the mean of its divisors is an integer number (100752780802).

Almost surely, 2^201505561603 is an apocalyptic number.

201505561603 is a deficient number, since it is larger than the sum of its proper divisors (1).

201505561603 is an equidigital number, since it uses as much as digits as its factorization.

201505561603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 201505561603 in words is "two hundred one billion, five hundred five million, five hundred sixty-one thousand, six hundred three".