19271399661 has 16 divisors (see below), whose sum is σ = 28629763200. Its totient is φ = 12811806144.

The previous prime is 19271399659. The next prime is 19271399669. The reversal of 19271399661 is 16699317291.

19271399661 is a `hidden beast` number, since 192 + 7 + 1 + 399 + 6 + 61 = 666.

It is not a de Polignac number, because 19271399661 - 2¹ = 19271399659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19271399598 and 19271399607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19271399669) 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 15 ways as a sum of consecutive naturals, for example, 984396 + ... + 1003781.

It is an arithmetic number, because the mean of its divisors is an integer number (1789360200).

Almost surely, 2^19271399661 is an apocalyptic number.

It is an amenable number.

19271399661 is a deficient number, since it is larger than the sum of its proper divisors (9358363539).

19271399661 is a wasteful number, since it uses less digits than its factorization.

19271399661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988545 (or 1988539 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The spelling of 19271399661 in words is "nineteen billion, two hundred seventy-one million, three hundred ninety-nine thousand, six hundred sixty-one".