11545561605 has 32 divisors (see below), whose sum is σ = 19102449024. Its totient is φ = 5951252736.

The previous prime is 11545561541. The next prime is 11545561631. The reversal of 11545561605 is 50616554511.

It is not a de Polignac number, because 11545561605 - 2⁶ = 11545561541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55114 + ... + 161643.

It is an arithmetic number, because the mean of its divisors is an integer number (596951532).

Almost surely, 2^11545561605 is an apocalyptic number.

11545561605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11545561605 is a deficient number, since it is larger than the sum of its proper divisors (7556887419).

11545561605 is a wasteful number, since it uses less digits than its factorization.

11545561605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216885.

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 11545561605 in words is "eleven billion, five hundred forty-five million, five hundred sixty-one thousand, six hundred five".