194555977225 has 27 divisors (see below), whose sum is σ = 254669880423. Its totient is φ = 147421193040.

The previous prime is 194555977211. The next prime is 194555977241. The reversal of 194555977225 is 522779555491.

The square root of 194555977225 is 441085.

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., 70040151801 + 124515825424 = 264651^2 + 352868^2 .

It is not a de Polignac number, because 194555977225 - 2⁵ = 194555977193 is a prime.

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, 41900754 + ... + 41905396.

Almost surely, 2^194555977225 is an apocalyptic number.

194555977225 is the 441085-th square number.

194555977225 is the 220543-rd centered octagonal number.

It is an amenable number.

194555977225 is a deficient number, since it is larger than the sum of its proper divisors (60113903198).

194555977225 is an frugal number, since it uses more digits than its factorization.

194555977225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334 (or 4667 counting only the distinct ones).

The product of its digits is 39690000, while the sum is 61.

The spelling of 194555977225 in words is "one hundred ninety-four billion, five hundred fifty-five million, nine hundred seventy-seven thousand, two hundred twenty-five".