19709867978 has 8 divisors (see below), whose sum is σ = 30006067872. Its totient is φ = 9707845356.

The previous prime is 19709867941. The next prime is 19709868011. The reversal of 19709867978 is 87976890791.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73544150 + ... + 73544417.

It is an arithmetic number, because the mean of its divisors is an integer number (3750758484).

Almost surely, 2^19709867978 is an apocalyptic number.

19709867978 is a deficient number, since it is larger than the sum of its proper divisors (10296199894).

19709867978 is a wasteful number, since it uses less digits than its factorization.

19709867978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147088636.

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

The spelling of 19709867978 in words is "nineteen billion, seven hundred nine million, eight hundred sixty-seven thousand, nine hundred seventy-eight".