19688708541 has 4 divisors (see below), whose sum is σ = 26251611392. Its totient is φ = 13125805692.

The previous prime is 19688708519. The next prime is 19688708587. The reversal of 19688708541 is 14580788691.

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 not a de Polignac number, because 19688708541 - 2¹¹ = 19688706493 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 (19688708141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281451421 + ... + 3281451426.

It is an arithmetic number, because the mean of its divisors is an integer number (6562902848).

Almost surely, 2^19688708541 is an apocalyptic number.

It is an amenable number.

19688708541 is a deficient number, since it is larger than the sum of its proper divisors (6562902851).

19688708541 is an equidigital number, since it uses as much as digits as its factorization.

19688708541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562902850.

The product of its (nonzero) digits is 3870720, while the sum is 57.

The spelling of 19688708541 in words is "nineteen billion, six hundred eighty-eight million, seven hundred eight thousand, five hundred forty-one".