19715804681 has 4 divisors (see below), whose sum is σ = 19720482000. Its totient is φ = 19711127364.

The previous prime is 19715804663. The next prime is 19715804683. The reversal of 19715804681 is 18640851791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19715804681 - 2⁶ = 19715804617 is a prime.

It is a super-2 number, since 2×19715804681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19715804683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332331 + ... + 2340768.

It is an arithmetic number, because the mean of its divisors is an integer number (4930120500).

Almost surely, 2^19715804681 is an apocalyptic number.

It is an amenable number.

19715804681 is a deficient number, since it is larger than the sum of its proper divisors (4677319).

19715804681 is an equidigital number, since it uses as much as digits as its factorization.

19715804681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677318.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 19715804681 in words is "nineteen billion, seven hundred fifteen million, eight hundred four thousand, six hundred eighty-one".