11644260563 has 4 divisors (see below), whose sum is σ = 12539972928. Its totient is φ = 10748548200.

The previous prime is 11644260553. The next prime is 11644260569. The reversal of 11644260563 is 36506244611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36506244611 = 103967 ⋅351133.

It is not a de Polignac number, because 11644260563 - 2⁴ = 11644260547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11644260569) 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, 447856163 + ... + 447856188.

It is an arithmetic number, because the mean of its divisors is an integer number (3134993232).

Almost surely, 2^11644260563 is an apocalyptic number.

11644260563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11644260563 is a deficient number, since it is larger than the sum of its proper divisors (895712365).

11644260563 is an equidigital number, since it uses as much as digits as its factorization.

11644260563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895712364.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 11644260563 in words is "eleven billion, six hundred forty-four million, two hundred sixty thousand, five hundred sixty-three".