19878205327 has 4 divisors (see below), whose sum is σ = 20924426680. Its totient is φ = 18831983976.

The previous prime is 19878205313. The next prime is 19878205339. The reversal of 19878205327 is 72350287891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19878205327 - 2⁷ = 19878205199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878205367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523110648 + ... + 523110685.

It is an arithmetic number, because the mean of its divisors is an integer number (5231106670).

Almost surely, 2^19878205327 is an apocalyptic number.

19878205327 is a deficient number, since it is larger than the sum of its proper divisors (1046221353).

19878205327 is a wasteful number, since it uses less digits than its factorization.

19878205327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046221352.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 19878205327 in words is "nineteen billion, eight hundred seventy-eight million, two hundred five thousand, three hundred twenty-seven".