19955649359 has 4 divisors (see below), whose sum is σ = 21129511104. Its totient is φ = 18781787616.

The previous prime is 19955649349. The next prime is 19955649377. The reversal of 19955649359 is 95394655991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95394655991 = 90631 ⋅1052561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19955649359 is a prime.

It is a super-2 number, since 2×19955649359² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19955649295 and 19955649304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19955649349) 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, 586930847 + ... + 586930880.

It is an arithmetic number, because the mean of its divisors is an integer number (5282377776).

Almost surely, 2^19955649359 is an apocalyptic number.

19955649359 is a deficient number, since it is larger than the sum of its proper divisors (1173861745).

19955649359 is a wasteful number, since it uses less digits than its factorization.

19955649359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173861744.

The product of its digits is 59049000, while the sum is 65.

The spelling of 19955649359 in words is "nineteen billion, nine hundred fifty-five million, six hundred forty-nine thousand, three hundred fifty-nine".