11855604563 has 6 divisors (see below), whose sum is σ = 13031367132. Its totient is φ = 10777822220.

The previous prime is 11855604539. The next prime is 11855604577. The reversal of 11855604563 is 36540655811.

It is not a de Polignac number, because 11855604563 - 2⁶ = 11855604499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11855604583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48989981 + ... + 48990222.

It is an arithmetic number, because the mean of its divisors is an integer number (2171894522).

Almost surely, 2^11855604563 is an apocalyptic number.

11855604563 is a deficient number, since it is larger than the sum of its proper divisors (1175762569).

11855604563 is an equidigital number, since it uses as much as digits as its factorization.

11855604563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97980225 (or 97980214 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 11855604563 in words is "eleven billion, eight hundred fifty-five million, six hundred four thousand, five hundred sixty-three".