19662706090225 has 81 divisors (see below), whose sum is σ = 27556321784481. Its totient is φ = 13907274004800.

The previous prime is 19662706090199. The next prime is 19662706090229. The reversal of 19662706090225 is 52209060726691.

The square root of 19662706090225 is 4434265.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1866592610289 + 17796113479936 = 1366233^2 + 4218544^2 .

It is not a de Polignac number, because 19662706090225 - 2¹¹ = 19662706088177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19662706090229) 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 80 ways as a sum of consecutive naturals, for example, 9023728186 + ... + 9023730364.

Almost surely, 2^{19662706090225} is an apocalyptic number.

19662706090225 is the 4434265-th square number.

19662706090225 is the 2217133-rd centered octagonal number.

It is an amenable number.

19662706090225 is a deficient number, since it is larger than the sum of its proper divisors (7893615694256).

19662706090225 is an frugal number, since it uses more digits than its factorization.

19662706090225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464 (or 2232 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 19662706090225 in words is "nineteen trillion, six hundred sixty-two billion, seven hundred six million, ninety thousand, two hundred twenty-five".