19666343476 has 24 divisors (see below), whose sum is σ = 38674952064. Its totient is φ = 8682131040.

The previous prime is 19666343467. The next prime is 19666343491. The reversal of 19666343476 is 67434366691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8220520 + ... + 8222911.

It is an arithmetic number, because the mean of its divisors is an integer number (1611456336).

Almost surely, 2^19666343476 is an apocalyptic number.

It is an amenable number.

19666343476 is a deficient number, since it is larger than the sum of its proper divisors (19008608588).

19666343476 is a wasteful number, since it uses less digits than its factorization.

19666343476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16443471 (or 16443469 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 55.

The spelling of 19666343476 in words is "nineteen billion, six hundred sixty-six million, three hundred forty-three thousand, four hundred seventy-six".