19956540269 has 8 divisors (see below), whose sum is σ = 20648847360. Its totient is φ = 19264509936.

The previous prime is 19956540239. The next prime is 19956540271. The reversal of 19956540269 is 96204565991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19956540269 - 2³² = 15661572973 is a prime.

It is a super-2 number, since 2×19956540269² (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 (19956540209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83252 + ... + 216434.

It is an arithmetic number, because the mean of its divisors is an integer number (2581105920).

Almost surely, 2^19956540269 is an apocalyptic number.

It is an amenable number.

19956540269 is a deficient number, since it is larger than the sum of its proper divisors (692307091).

19956540269 is a wasteful number, since it uses less digits than its factorization.

19956540269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138379.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 19956540269 in words is "nineteen billion, nine hundred fifty-six million, five hundred forty thousand, two hundred sixty-nine".