11005531505 has 16 divisors (see below), whose sum is σ = 13280572944. Its totient is φ = 8755272960.

The previous prime is 11005531399. The next prime is 11005531517. The reversal of 11005531505 is 50513550011.

It can be written as a sum of positive squares in 8 ways, for example, as 7916728576 + 3088802929 = 88976^2 + 55577^2 .

It is not a de Polignac number, because 11005531505 - 2¹² = 11005527409 is a prime.

It is a super-2 number, since 2×11005531505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659039 + ... + 675531.

It is an arithmetic number, because the mean of its divisors is an integer number (830035809).

Almost surely, 2^11005531505 is an apocalyptic number.

It is an amenable number.

11005531505 is a deficient number, since it is larger than the sum of its proper divisors (2275041439).

11005531505 is a wasteful number, since it uses less digits than its factorization.

11005531505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17236.

The product of its (nonzero) digits is 1875, while the sum is 26.

The spelling of 11005531505 in words is "eleven billion, five million, five hundred thirty-one thousand, five hundred five".