1500550505561 has 2 divisors, whose sum is σ = 1500550505562. Its totient is φ = 1500550505560.

The previous prime is 1500550505533. The next prime is 1500550505621. The reversal of 1500550505561 is 1655050550051.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1338267217225 + 162283288336 = 1156835^2 + 402844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1500550505561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1500550595561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750275252780 + 750275252781.

It is an arithmetic number, because the mean of its divisors is an integer number (750275252781).

Almost surely, 2^{1500550505561} is an apocalyptic number.

It is an amenable number.

1500550505561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500550505561 is an equidigital number, since it uses as much as digits as its factorization.

1500550505561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 1500550505561 in words is "one trillion, five hundred billion, five hundred fifty million, five hundred five thousand, five hundred sixty-one".