19985746078 has 8 divisors (see below), whose sum is σ = 30010891680. Its totient is φ = 9982115520.

The previous prime is 19985746073. The next prime is 19985746103. The reversal of 19985746078 is 87064758991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985746073) 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, 5376438 + ... + 5380153.

It is an arithmetic number, because the mean of its divisors is an integer number (3751361460).

Almost surely, 2^19985746078 is an apocalyptic number.

19985746078 is a deficient number, since it is larger than the sum of its proper divisors (10025145602).

19985746078 is a wasteful number, since it uses less digits than its factorization.

19985746078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757522.

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 19985746078 in words is "nineteen billion, nine hundred eighty-five million, seven hundred forty-six thousand, seventy-eight".