19718795418 has 16 divisors (see below), whose sum is σ = 45071532480. Its totient is φ = 5633941536.

The previous prime is 19718795417. The next prime is 19718795419. The reversal of 19718795418 is 81459781791.

It is an interprime number because it is at equal distance from previous prime (19718795417) and next prime (19718795419).

It is not an unprimeable number, because it can be changed into a prime (19718795417) 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, 234747523 + ... + 234747606.

It is an arithmetic number, because the mean of its divisors is an integer number (2816970780).

Almost surely, 2^19718795418 is an apocalyptic number.

19718795418 is an abundant number, since it is smaller than the sum of its proper divisors (25352737062).

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

19718795418 is a wasteful number, since it uses less digits than its factorization.

19718795418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469495141.

The product of its digits is 5080320, while the sum is 60.

The spelling of 19718795418 in words is "nineteen billion, seven hundred eighteen million, seven hundred ninety-five thousand, four hundred eighteen".