11505505501 has 16 divisors (see below), whose sum is σ = 13624905600. Its totient is φ = 9506161728.

The previous prime is 11505505373. The next prime is 11505505553. The reversal of 11505505501 is 10550550511.

11505505501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11505505501 - 2⁷ = 11505505373 is a prime.

It is a super-2 number, since 2×11505505501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11505505501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505505591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78210 + ... + 170668.

It is an arithmetic number, because the mean of its divisors is an integer number (851556600).

Almost surely, 2^11505505501 is an apocalyptic number.

It is an amenable number.

11505505501 is a deficient number, since it is larger than the sum of its proper divisors (2119400099).

11505505501 is an equidigital number, since it uses as much as digits as its factorization.

11505505501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93108.

The product of its (nonzero) digits is 3125, while the sum is 28.

The spelling of 11505505501 in words is "eleven billion, five hundred five million, five hundred five thousand, five hundred one".