199666452825 has 72 divisors (see below), whose sum is σ = 430225390400. Its totient is φ = 86472074880.

The previous prime is 199666452823. The next prime is 199666452841. The reversal of 199666452825 is 528254666991.

It is a happy number.

199666452825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199666452825 - 2¹ = 199666452823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (199666452823) 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 71 ways as a sum of consecutive naturals, for example, 3306190 + ... + 3366039.

Almost surely, 2^199666452825 is an apocalyptic number.

199666452825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199666452825 is an abundant number, since it is smaller than the sum of its proper divisors (230558937575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199666452825 is a wasteful number, since it uses less digits than its factorization.

199666452825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672271 (or 6672263 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 199666452825 in words is "one hundred ninety-nine billion, six hundred sixty-six million, four hundred fifty-two thousand, eight hundred twenty-five".