115644563999 has 4 divisors (see below), whose sum is σ = 115645244664. Its totient is φ = 115643883336.

The previous prime is 115644563963. The next prime is 115644564031. The reversal of 115644563999 is 999365446511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 999365446511 = 2011 ⋅496949501.

It is a cyclic number.

It is not a de Polignac number, because 115644563999 - 2⁸ = 115644563743 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 (115644563599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149969 + ... + 503765.

It is an arithmetic number, because the mean of its divisors is an integer number (28911311166).

Almost surely, 2^115644563999 is an apocalyptic number.

115644563999 is a deficient number, since it is larger than the sum of its proper divisors (680665).

115644563999 is an equidigital number, since it uses as much as digits as its factorization.

115644563999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680664.

The product of its digits is 31492800, while the sum is 62.

The spelling of 115644563999 in words is "one hundred fifteen billion, six hundred forty-four million, five hundred sixty-three thousand, nine hundred ninety-nine".