19818404313 has 16 divisors (see below), whose sum is σ = 28735113600. Its totient is φ = 12098992896.

The previous prime is 19818404303. The next prime is 19818404351. The reversal of 19818404313 is 31340481891.

It is a happy number.

It is not a de Polignac number, because 19818404313 - 2¹⁰ = 19818403289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19818404303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5249413 + ... + 5253186.

It is an arithmetic number, because the mean of its divisors is an integer number (1795944600).

Almost surely, 2^19818404313 is an apocalyptic number.

It is an amenable number.

19818404313 is a deficient number, since it is larger than the sum of its proper divisors (8916709287).

19818404313 is a wasteful number, since it uses less digits than its factorization.

19818404313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10502656.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 19818404313 in words is "nineteen billion, eight hundred eighteen million, four hundred four thousand, three hundred thirteen".