19978879706 has 8 divisors (see below), whose sum is σ = 31731161940. Its totient is φ = 9401825728.

The previous prime is 19978879703. The next prime is 19978879733. The reversal of 19978879706 is 60797887991.

It can be written as a sum of positive squares in 2 ways, for example, as 17771289481 + 2207590225 = 133309^2 + 46985^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 19978879706.

It is not an unprimeable number, because it can be changed into a prime (19978879703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293807021 + ... + 293807088.

Almost surely, 2^19978879706 is an apocalyptic number.

19978879706 is a deficient number, since it is larger than the sum of its proper divisors (11752282234).

19978879706 is a wasteful number, since it uses less digits than its factorization.

19978879706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587614128.

The product of its (nonzero) digits is 96018048, while the sum is 71.

The spelling of 19978879706 in words is "nineteen billion, nine hundred seventy-eight million, eight hundred seventy-nine thousand, seven hundred six".