19964218434 has 16 divisors (see below), whose sum is σ = 40233235680. Its totient is φ = 6603939680.

The previous prime is 19964218433. The next prime is 19964218459. The reversal of 19964218434 is 43481246991.

It is not an unprimeable number, because it can be changed into a prime (19964218433) 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, 12699099 + ... + 12700670.

It is an arithmetic number, because the mean of its divisors is an integer number (2514577230).

Almost surely, 2^19964218434 is an apocalyptic number.

19964218434 is an abundant number, since it is smaller than the sum of its proper divisors (20269017246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19964218434 is a wasteful number, since it uses less digits than its factorization.

19964218434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25399905.

The product of its digits is 1492992, while the sum is 51.

The spelling of 19964218434 in words is "nineteen billion, nine hundred sixty-four million, two hundred eighteen thousand, four hundred thirty-four".