19491484385 has 16 divisors (see below), whose sum is σ = 24960669696. Its totient is φ = 14560374528.

The previous prime is 19491484291. The next prime is 19491484399. The reversal of 19491484385 is 58348419491.

It is a cyclic number.

It is not a de Polignac number, because 19491484385 - 2¹² = 19491480289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19491484385.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892007 + ... + 913596.

It is an arithmetic number, because the mean of its divisors is an integer number (1560041856).

Almost surely, 2^19491484385 is an apocalyptic number.

It is an amenable number.

19491484385 is a deficient number, since it is larger than the sum of its proper divisors (5469185311).

19491484385 is a wasteful number, since it uses less digits than its factorization.

19491484385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805752.

The product of its digits is 4976640, while the sum is 56.

The spelling of 19491484385 in words is "nineteen billion, four hundred ninety-one million, four hundred eighty-four thousand, three hundred eighty-five".