19666531027 has 8 divisors (see below), whose sum is σ = 23104735920. Its totient is φ = 16503382560.

The previous prime is 19666531013. The next prime is 19666531033. The reversal of 19666531027 is 72013566691.

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

It is a cyclic number.

It is not a de Polignac number, because 19666531027 - 2¹¹ = 19666528979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19666531727) 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, 68763952 + ... + 68764237.

It is an arithmetic number, because the mean of its divisors is an integer number (2888091990).

Almost surely, 2^19666531027 is an apocalyptic number.

19666531027 is a deficient number, since it is larger than the sum of its proper divisors (3438204893).

19666531027 is a wasteful number, since it uses less digits than its factorization.

19666531027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137528213.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 19666531027 in words is "nineteen billion, six hundred sixty-six million, five hundred thirty-one thousand, twenty-seven".