19649724117 has 4 divisors (see below), whose sum is σ = 26199632160. Its totient is φ = 13099816076.

The previous prime is 19649724071. The next prime is 19649724121. The reversal of 19649724117 is 71142794691.

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 a cyclic number.

It is not a de Polignac number, because 19649724117 - 2⁶ = 19649724053 is a prime.

It is a super-2 number, since 2×19649724117² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19649724117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649724187) 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, 3274954017 + ... + 3274954022.

It is an arithmetic number, because the mean of its divisors is an integer number (6549908040).

Almost surely, 2^19649724117 is an apocalyptic number.

It is an amenable number.

19649724117 is a deficient number, since it is larger than the sum of its proper divisors (6549908043).

19649724117 is an equidigital number, since it uses as much as digits as its factorization.

19649724117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6549908042.

The product of its digits is 762048, while the sum is 51.

The spelling of 19649724117 in words is "nineteen billion, six hundred forty-nine million, seven hundred twenty-four thousand, one hundred seventeen".