11859638456109 has 4 divisors (see below), whose sum is σ = 15812851274816. Its totient is φ = 7906425637404.

The previous prime is 11859638456093. The next prime is 11859638456189. The reversal of 11859638456109 is 90165483695811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11859638456109 - 2⁴ = 11859638456093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11859638456109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11859638456189) 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, 1976606409349 + ... + 1976606409354.

It is an arithmetic number, because the mean of its divisors is an integer number (3953212818704).

Almost surely, 2^{11859638456109} is an apocalyptic number.

It is an amenable number.

11859638456109 is a deficient number, since it is larger than the sum of its proper divisors (3953212818707).

11859638456109 is an equidigital number, since it uses as much as digits as its factorization.

11859638456109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953212818706.

The product of its (nonzero) digits is 55987200, while the sum is 66.

The spelling of 11859638456109 in words is "eleven trillion, eight hundred fifty-nine billion, six hundred thirty-eight million, four hundred fifty-six thousand, one hundred nine".