19450507985 has 16 divisors (see below), whose sum is σ = 24528922176. Its totient is φ = 14787759168.

The previous prime is 19450507981. The next prime is 19450508029. The reversal of 19450507985 is 58970505491.

It is a happy number.

It is not a de Polignac number, because 19450507985 - 2² = 19450507981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19450507981) 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 15 ways as a sum of consecutive naturals, for example, 1214579 + ... + 1230488.

It is an arithmetic number, because the mean of its divisors is an integer number (1533057636).

Almost surely, 2^19450507985 is an apocalyptic number.

It is an amenable number.

19450507985 is a deficient number, since it is larger than the sum of its proper divisors (5078414191).

19450507985 is a wasteful number, since it uses less digits than its factorization.

19450507985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445152.

The product of its (nonzero) digits is 2268000, while the sum is 53.

The spelling of 19450507985 in words is "nineteen billion, four hundred fifty million, five hundred seven thousand, nine hundred eighty-five".