19778241966 has 32 divisors (see below), whose sum is σ = 47866671360. Its totient is φ = 5318518656.

The previous prime is 19778241953. The next prime is 19778241979. The reversal of 19778241966 is 66914287791.

It is an interprime number because it is at equal distance from previous prime (19778241953) and next prime (19778241979).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13849596 + ... + 13851023.

It is an arithmetic number, because the mean of its divisors is an integer number (1495833480).

Almost surely, 2^19778241966 is an apocalyptic number.

19778241966 is an abundant number, since it is smaller than the sum of its proper divisors (28088429394).

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

19778241966 is a wasteful number, since it uses less digits than its factorization.

19778241966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27700648.

The product of its digits is 9144576, while the sum is 60.

The spelling of 19778241966 in words is "nineteen billion, seven hundred seventy-eight million, two hundred forty-one thousand, nine hundred sixty-six".