19119665740816 has 45 divisors (see below), whose sum is σ = 39352225055421. Its totient is φ = 8997349837056.

The previous prime is 19119665740793. The next prime is 19119665740823. The reversal of 19119665740816 is 61804756691191.

The square root of 19119665740816 is 4372604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14885552912400 + 4234112828416 = 3858180^2 + 2057696^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 297304921 + ... + 297369223.

Almost surely, 2^{19119665740816} is an apocalyptic number.

19119665740816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19119665740816 is the 4372604-th square number.

It is an amenable number.

19119665740816 is an abundant number, since it is smaller than the sum of its proper divisors (20232559314605).

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

19119665740816 is an frugal number, since it uses more digits than its factorization.

19119665740816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128648 (or 64322 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 19119665740816 in words is "nineteen trillion, one hundred nineteen billion, six hundred sixty-five million, seven hundred forty thousand, eight hundred sixteen".