19886614032481 has 15 divisors (see below), whose sum is σ = 23199924183891. Its totient is φ = 17045481874176.

The previous prime is 19886614032457. The next prime is 19886614032503. The reversal of 19886614032481 is 18423041668891.

The square root of 19886614032481 is 4459441.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4688779598881 + 15197834433600 = 2165359^2 + 3898440^2 .

It is not a de Polignac number, because 19886614032481 - 2⁵ = 19886614032449 is a prime.

It is a super-2 number, since 2×19886614032481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19886614032421) 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 14 ways as a sum of consecutive naturals, for example, 218467105 + ... + 218558113.

Almost surely, 2^{19886614032481} is an apocalyptic number.

19886614032481 is the 4459441-st square number.

19886614032481 is the 2229721-st centered octagonal number.

It is an amenable number.

19886614032481 is a deficient number, since it is larger than the sum of its proper divisors (3313310151410).

19886614032481 is an frugal number, since it uses more digits than its factorization.

19886614032481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182046 (or 91016 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 61.

The spelling of 19886614032481 in words is "nineteen trillion, eight hundred eighty-six billion, six hundred fourteen million, thirty-two thousand, four hundred eighty-one".