19628249217 has 4 divisors (see below), whose sum is σ = 26170998960. Its totient is φ = 13085499476.

The previous prime is 19628249203. The next prime is 19628249257. The reversal of 19628249217 is 71294282691.

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 19628249217 - 2⁷ = 19628249089 is a prime.

It is a super-3 number, since 3×19628249217³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 19628249217.

It is not an unprimeable number, because it can be changed into a prime (19628249257) 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, 3271374867 + ... + 3271374872.

It is an arithmetic number, because the mean of its divisors is an integer number (6542749740).

Almost surely, 2^19628249217 is an apocalyptic number.

It is an amenable number.

19628249217 is a deficient number, since it is larger than the sum of its proper divisors (6542749743).

19628249217 is an equidigital number, since it uses as much as digits as its factorization.

19628249217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6542749742.

The product of its digits is 870912, while the sum is 51.

The spelling of 19628249217 in words is "nineteen billion, six hundred twenty-eight million, two hundred forty-nine thousand, two hundred seventeen".