19913790225169 has 9 divisors (see below), whose sum is σ = 19933833550971. Its totient is φ = 19893767046000.

The previous prime is 19913790225103. The next prime is 19913790225193. The reversal of 19913790225169 is 96152209731991.

The square root of 19913790225169 is 4462487.

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., 10711789314769 + 9202000910400 = 3272887^2 + 3033480^2 .

It is not a de Polignac number, because 19913790225169 - 2²⁹ = 19913253354257 is a prime.

It is a super-2 number, since 2×19913790225169² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19913790225169.

It is not an unprimeable number, because it can be changed into a prime (19913799225169) 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 8 ways as a sum of consecutive naturals, for example, 6635716669 + ... + 6635719669.

Almost surely, 2^{19913790225169} is an apocalyptic number.

19913790225169 is the 4462487-th square number.

19913790225169 is the 2231244-th centered octagonal number.

It is an amenable number.

19913790225169 is a deficient number, since it is larger than the sum of its proper divisors (20043325802).

19913790225169 is an frugal number, since it uses more digits than its factorization.

19913790225169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976 (or 4488 counting only the distinct ones).

The product of its (nonzero) digits is 16533720, while the sum is 64.

The spelling of 19913790225169 in words is "nineteen trillion, nine hundred thirteen billion, seven hundred ninety million, two hundred twenty-five thousand, one hundred sixty-nine".