19726486869 has 8 divisors (see below), whose sum is σ = 27686297440. Its totient is φ = 12458833776.

The previous prime is 19726486867. The next prime is 19726486873. The reversal of 19726486869 is 96868462791.

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

It is not a de Polignac number, because 19726486869 - 2¹ = 19726486867 is a prime.

It is a super-2 number, since 2×19726486869² (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 (19726486861) 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, 173039302 + ... + 173039415.

It is an arithmetic number, because the mean of its divisors is an integer number (3460787180).

Almost surely, 2^19726486869 is an apocalyptic number.

19726486869 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19726486869 is a deficient number, since it is larger than the sum of its proper divisors (7959810571).

19726486869 is a wasteful number, since it uses less digits than its factorization.

19726486869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346078739.

The product of its digits is 62705664, while the sum is 66.

The spelling of 19726486869 in words is "nineteen billion, seven hundred twenty-six million, four hundred eighty-six thousand, eight hundred sixty-nine".