19696545491 has 64 divisors (see below), whose sum is σ = 25662873600. Its totient is φ = 14713145856.

The previous prime is 19696545481. The next prime is 19696545511. The reversal of 19696545491 is 19454569691.

It is not a de Polignac number, because 19696545491 - 2¹⁴ = 19696529107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19696545491.

It is not an unprimeable number, because it can be changed into a prime (19696545431) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19328780 + ... + 19329798.

It is an arithmetic number, because the mean of its divisors is an integer number (400982400).

Almost surely, 2^19696545491 is an apocalyptic number.

19696545491 is a deficient number, since it is larger than the sum of its proper divisors (5966328109).

19696545491 is a wasteful number, since it uses less digits than its factorization.

19696545491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248.

The product of its digits is 10497600, while the sum is 59.

The spelling of 19696545491 in words is "nineteen billion, six hundred ninety-six million, five hundred forty-five thousand, four hundred ninety-one".