1005505561563 has 8 divisors (see below), whose sum is σ = 1343339440128. Its totient is φ = 669004362024.

The previous prime is 1005505561561. The next prime is 1005505561661. The reversal of 1005505561563 is 3651655055001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1005505561563 - 2¹ = 1005505561561 is a prime.

It is a super-2 number, since 2×1005505561563² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1005505561561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333167995 + ... + 333171012.

It is an arithmetic number, because the mean of its divisors is an integer number (167917430016).

Almost surely, 2^{1005505561563} is an apocalyptic number.

1005505561563 is a deficient number, since it is larger than the sum of its proper divisors (337833878565).

1005505561563 is an equidigital number, since it uses as much as digits as its factorization.

1005505561563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666339513.

The product of its (nonzero) digits is 337500, while the sum is 42.

The spelling of 1005505561563 in words is "one trillion, five billion, five hundred five million, five hundred sixty-one thousand, five hundred sixty-three".