19819730465 has 16 divisors (see below), whose sum is σ = 24196527360. Its totient is φ = 15580767360.

The previous prime is 19819730387. The next prime is 19819730477. The reversal of 19819730465 is 56403791891.

It is not a de Polignac number, because 19819730465 - 2¹⁴ = 19819714081 is a prime.

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, 804125 + ... + 828405.

It is an arithmetic number, because the mean of its divisors is an integer number (1512282960).

Almost surely, 2^19819730465 is an apocalyptic number.

It is an amenable number.

19819730465 is a deficient number, since it is larger than the sum of its proper divisors (4376796895).

19819730465 is a wasteful number, since it uses less digits than its factorization.

19819730465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27112.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 19819730465 in words is "nineteen billion, eight hundred nineteen million, seven hundred thirty thousand, four hundred sixty-five".