19696405647 has 8 divisors (see below), whose sum is σ = 26379641344. Its totient is φ = 13072053528.

The previous prime is 19696405607. The next prime is 19696405657. The reversal of 19696405647 is 74650469691.

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

It is not a de Polignac number, because 19696405647 - 2¹² = 19696401551 is a prime.

It is a super-2 number, since 2×19696405647² (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 (19696405607) 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, 14720113 + ... + 14721450.

It is an arithmetic number, because the mean of its divisors is an integer number (3297455168).

Almost surely, 2^19696405647 is an apocalyptic number.

19696405647 is a deficient number, since it is larger than the sum of its proper divisors (6683235697).

19696405647 is a wasteful number, since it uses less digits than its factorization.

19696405647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29441789.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 19696405647 in words is "nineteen billion, six hundred ninety-six million, four hundred five thousand, six hundred forty-seven".