11644787287 has 4 divisors (see below), whose sum is σ = 13308328336. Its totient is φ = 9981246240.

The previous prime is 11644787267. The next prime is 11644787291. The reversal of 11644787287 is 78278744611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78278744611 = 163 ⋅480237697.

It is a de Polignac number, because none of the positive numbers 2^k-11644787287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11644787267) 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, 831770514 + ... + 831770527.

It is an arithmetic number, because the mean of its divisors is an integer number (3327082084).

Almost surely, 2^11644787287 is an apocalyptic number.

11644787287 is a deficient number, since it is larger than the sum of its proper divisors (1663541049).

11644787287 is an equidigital number, since it uses as much as digits as its factorization.

11644787287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663541048.

The product of its digits is 4214784, while the sum is 55.

The spelling of 11644787287 in words is "eleven billion, six hundred forty-four million, seven hundred eighty-seven thousand, two hundred eighty-seven".