19866478002 has 64 divisors (see below), whose sum is σ = 46093411584. Its totient is φ = 5591174400.

The previous prime is 19866477977. The next prime is 19866478039. The reversal of 19866478002 is 20087466891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 823788 + ... + 847560.

It is an arithmetic number, because the mean of its divisors is an integer number (720209556).

Almost surely, 2^19866478002 is an apocalyptic number.

19866478002 is an abundant number, since it is smaller than the sum of its proper divisors (26226933582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19866478002 is a wasteful number, since it uses less digits than its factorization.

19866478002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24083.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 19866478002 in words is "nineteen billion, eight hundred sixty-six million, four hundred seventy-eight thousand, two".