19995500269 has 4 divisors (see below), whose sum is σ = 21047895040. Its totient is φ = 18943105500.

The previous prime is 19995500267. The next prime is 19995500281. The reversal of 19995500269 is 96200559991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96200559991 = 41149 ⋅2337859.

It is a cyclic number.

It is not a de Polignac number, because 19995500269 - 2¹ = 19995500267 is a prime.

It is a super-2 number, since 2×19995500269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995500263) 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, 526197357 + ... + 526197394.

It is an arithmetic number, because the mean of its divisors is an integer number (5261973760).

Almost surely, 2^19995500269 is an apocalyptic number.

19995500269 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19995500269 is a deficient number, since it is larger than the sum of its proper divisors (1052394771).

19995500269 is a wasteful number, since it uses less digits than its factorization.

19995500269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052394770.

The product of its (nonzero) digits is 1968300, while the sum is 55.

The spelling of 19995500269 in words is "nineteen billion, nine hundred ninety-five million, five hundred thousand, two hundred sixty-nine".