11503666645 has 4 divisors (see below), whose sum is σ = 13804399980. Its totient is φ = 9202933312.

The previous prime is 11503666631. The next prime is 11503666649. The reversal of 11503666645 is 54666630511.

11503666645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54666630511 = 3821 ⋅14306891.

It can be written as a sum of positive squares in 2 ways, for example, as 3962828401 + 7540838244 = 62951^2 + 86838^2 .

It is a cyclic number.

It is not a de Polignac number, because 11503666645 - 2¹⁵ = 11503633877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503666649) 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 3 ways as a sum of consecutive naturals, for example, 1150366660 + ... + 1150366669.

It is an arithmetic number, because the mean of its divisors is an integer number (3451099995).

Almost surely, 2^11503666645 is an apocalyptic number.

It is an amenable number.

11503666645 is a deficient number, since it is larger than the sum of its proper divisors (2300733335).

11503666645 is an equidigital number, since it uses as much as digits as its factorization.

11503666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300733334.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 11503666645 in words is "eleven billion, five hundred three million, six hundred sixty-six thousand, six hundred forty-five".