19975308643 has 8 divisors (see below), whose sum is σ = 20009906640. Its totient is φ = 19940734080.

The previous prime is 19975308641. The next prime is 19975308673. The reversal of 19975308643 is 34680357991.

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 19975308643 - 2¹ = 19975308641 is a prime.

It is a super-2 number, since 2×19975308643² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19975308641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2689471 + ... + 2696887.

It is an arithmetic number, because the mean of its divisors is an integer number (2501238330).

Almost surely, 2^19975308643 is an apocalyptic number.

19975308643 is a deficient number, since it is larger than the sum of its proper divisors (34597997).

19975308643 is an equidigital number, since it uses as much as digits as its factorization.

19975308643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11717.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 19975308643 in words is "nineteen billion, nine hundred seventy-five million, three hundred eight thousand, six hundred forty-three".