11643281499 has 8 divisors (see below), whose sum is σ = 15605655552. Its totient is φ = 7721547560.

The previous prime is 11643281423. The next prime is 11643281509. The reversal of 11643281499 is 99418234611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11643281499 - 2¹² = 11643277403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11643281399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10159359 + ... + 10160504.

It is an arithmetic number, because the mean of its divisors is an integer number (1950706944).

Almost surely, 2^11643281499 is an apocalyptic number.

11643281499 is a deficient number, since it is larger than the sum of its proper divisors (3962374053).

11643281499 is a wasteful number, since it uses less digits than its factorization.

11643281499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20320057.

The product of its digits is 373248, while the sum is 48.

The spelling of 11643281499 in words is "eleven billion, six hundred forty-three million, two hundred eighty-one thousand, four hundred ninety-nine".