19666985846 has 8 divisors (see below), whose sum is σ = 30297789120. Its totient is φ = 9567722808.

The previous prime is 19666985831. The next prime is 19666985879. The reversal of 19666985846 is 64858966691.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132884966 + ... + 132885113.

It is an arithmetic number, because the mean of its divisors is an integer number (3787223640).

Almost surely, 2^19666985846 is an apocalyptic number.

19666985846 is a deficient number, since it is larger than the sum of its proper divisors (10630803274).

19666985846 is a wasteful number, since it uses less digits than its factorization.

19666985846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265770118.

The product of its digits is 134369280, while the sum is 68.

The spelling of 19666985846 in words is "nineteen billion, six hundred sixty-six million, nine hundred eighty-five thousand, eight hundred forty-six".