19451488268 has 6 divisors (see below), whose sum is σ = 34040104476.
Its totient is φ = 9725744132.
The previous prime is 19451488267. The next prime is 19451488271. The reversal of 19451488268 is 86288415491.
It is a super-3 number, since 3×194514882683 (a number of 32 digits) contains 333 as substring.
It is not an unprimeable number, because it can be changed into a prime (19451488267) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2431436030 + ... + 2431436037.
It is an arithmetic number, because the mean of its divisors is an integer number (5673350746).
Almost surely, 219451488268 is an apocalyptic number.
It is an amenable number.
19451488268 is a deficient number, since it is larger than the sum of its proper divisors (14588616208).
19451488268 is a wasteful number, since it uses less digits than its factorization.
19451488268 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4862872071 (or 4862872069 counting only the distinct ones).
The product of its digits is 4423680, while the sum is 56.
The spelling of 19451488268 in words is "nineteen billion, four hundred fifty-one million, four hundred eighty-eight thousand, two hundred sixty-eight".