19938412910025 has 27 divisors (see below), whose sum is σ = 35712032867719. Its totient is φ = 10633784496720.

The previous prime is 19938412909999. The next prime is 19938412910047. The reversal of 19938412910025 is 52001921483991.

It is a happy number.

The square root of 19938412910025 is 4465245.

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

19938412910025 is a `hidden beast` number, since 1 + 99 + 38 + 412 + 9 + 100 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7177828647609 + 12760584262416 = 2679147^2 + 3572196^2 .

It is not a de Polignac number, because 19938412910025 - 2²³ = 19938404521417 is a prime.

It is a super-3 number, since 3×19938412910025³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 66829834 + ... + 67127516.

Almost surely, 2^{19938412910025} is an apocalyptic number.

19938412910025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19938412910025 is the 4465245-th square number.

19938412910025 is the 2232623-rd centered octagonal number.

It is an amenable number.

19938412910025 is a deficient number, since it is larger than the sum of its proper divisors (15773619957694).

19938412910025 is an frugal number, since it uses more digits than its factorization.

19938412910025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595382 (or 297691 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 19938412910025 in words is "nineteen trillion, nine hundred thirty-eight billion, four hundred twelve million, nine hundred ten thousand, twenty-five".