19681840013 has 8 divisors (see below), whose sum is σ = 21483409440. Its totient is φ = 17882322480.

The previous prime is 19681839967. The next prime is 19681840019. The reversal of 19681840013 is 31004818691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19681840013 - 2¹⁰ = 19681838989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19681840019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492878 + ... + 531311.

It is an arithmetic number, because the mean of its divisors is an integer number (2685426180).

Almost surely, 2^19681840013 is an apocalyptic number.

It is an amenable number.

19681840013 is a deficient number, since it is larger than the sum of its proper divisors (1801569427).

19681840013 is a wasteful number, since it uses less digits than its factorization.

19681840013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025947.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 19681840013 in words is "nineteen billion, six hundred eighty-one million, eight hundred forty thousand, thirteen".