19680645181 has 4 divisors (see below), whose sum is σ = 19917761472. Its totient is φ = 19443528892.

The previous prime is 19680645143. The next prime is 19680645203. The reversal of 19680645181 is 18154608691.

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 19680645181 - 2¹⁷ = 19680514109 is a prime.

It is a super-2 number, since 2×19680645181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19680645121) 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, 118558021 + ... + 118558186.

It is an arithmetic number, because the mean of its divisors is an integer number (4979440368).

Almost surely, 2^19680645181 is an apocalyptic number.

It is an amenable number.

19680645181 is a deficient number, since it is larger than the sum of its proper divisors (237116291).

19680645181 is an equidigital number, since it uses as much as digits as its factorization.

19680645181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237116290.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 19680645181 in words is "nineteen billion, six hundred eighty million, six hundred forty-five thousand, one hundred eighty-one".