19985490117 has 6 divisors (see below), whose sum is σ = 28867930182. Its totient is φ = 13323660072.

The previous prime is 19985490113. The next prime is 19985490127. The reversal of 19985490117 is 71109458991.

19985490117 is a `hidden beast` number, since 1 + 9 + 98 + 549 + 0 + 1 + 1 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19794801636 + 190688481 = 140694^2 + 13809^2 .

It is not a de Polignac number, because 19985490117 - 2² = 19985490113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985490113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1110304998 + ... + 1110305015.

It is an arithmetic number, because the mean of its divisors is an integer number (4811321697).

Almost surely, 2^19985490117 is an apocalyptic number.

It is an amenable number.

19985490117 is a deficient number, since it is larger than the sum of its proper divisors (8882440065).

19985490117 is a wasteful number, since it uses less digits than its factorization.

19985490117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220610019 (or 2220610016 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 54.

The spelling of 19985490117 in words is "nineteen billion, nine hundred eighty-five million, four hundred ninety thousand, one hundred seventeen".