11503135643 has 4 divisors (see below), whose sum is σ = 11521901568. Its totient is φ = 11484369720.

The previous prime is 11503135639. The next prime is 11503135661. The reversal of 11503135643 is 34653130511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11503135643 - 2² = 11503135639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11503135543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9382043 + ... + 9383268.

It is an arithmetic number, because the mean of its divisors is an integer number (2880475392).

Almost surely, 2^11503135643 is an apocalyptic number.

11503135643 is a deficient number, since it is larger than the sum of its proper divisors (18765925).

11503135643 is an equidigital number, since it uses as much as digits as its factorization.

11503135643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18765924.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 11503135643 in words is "eleven billion, five hundred three million, one hundred thirty-five thousand, six hundred forty-three".