19897453539 has 12 divisors (see below), whose sum is σ = 29037064056. Its totient is φ = 13128216192.

The previous prime is 19897453517. The next prime is 19897453553. The reversal of 19897453539 is 93535479891.

19897453539 is a `hidden beast` number, since 1 + 9 + 8 + 97 + 4 + 5 + 3 + 539 = 666.

It is not a de Polignac number, because 19897453539 - 2¹⁵ = 19897420771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19897453559) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11395149 + ... + 11396894.

It is an arithmetic number, because the mean of its divisors is an integer number (2419755338).

Almost surely, 2^19897453539 is an apocalyptic number.

19897453539 is a deficient number, since it is larger than the sum of its proper divisors (9139610517).

19897453539 is a wasteful number, since it uses less digits than its factorization.

19897453539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22792146 (or 22792143 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 63.

The spelling of 19897453539 in words is "nineteen billion, eight hundred ninety-seven million, four hundred fifty-three thousand, five hundred thirty-nine".