19644795117 has 24 divisors (see below), whose sum is σ = 28834284024. Its totient is φ = 12886493184.

The previous prime is 19644795017. The next prime is 19644795119. The reversal of 19644795117 is 71159744691.

It is a happy number.

19644795117 is a `hidden beast` number, since 19 + 6 + 44 + 79 + 511 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4561516521 + 15083278596 = 67539^2 + 122814^2 .

It is not a de Polignac number, because 19644795117 - 2²⁷ = 19510577389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19644795119) 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 23 ways as a sum of consecutive naturals, for example, 85993 + ... + 216065.

It is an arithmetic number, because the mean of its divisors is an integer number (1201428501).

Almost surely, 2^19644795117 is an apocalyptic number.

It is an amenable number.

19644795117 is a deficient number, since it is larger than the sum of its proper divisors (9189488907).

19644795117 is a wasteful number, since it uses less digits than its factorization.

19644795117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130349 (or 130346 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 19644795117 in words is "nineteen billion, six hundred forty-four million, seven hundred ninety-five thousand, one hundred seventeen".