194564799025 has 27 divisors (see below), whose sum is σ = 246634164769. Its totient is φ = 152258936480.

The previous prime is 194564799019. The next prime is 194564799041. The reversal of 194564799025 is 520997465491.

The square root of 194564799025 is 441095.

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 41460721 + 194523338304 = 6439^2 + 441048^2 .

It is not a de Polignac number, because 194564799025 - 2²³ = 194556410417 is a prime.

It is a super-2 number, since 2×194564799025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 103656387 + ... + 103658263.

Almost surely, 2^194564799025 is an apocalyptic number.

194564799025 is the 441095-th square number.

194564799025 is the 220548-th centered octagonal number.

It is an amenable number.

194564799025 is a deficient number, since it is larger than the sum of its proper divisors (52069365744).

194564799025 is an frugal number, since it uses more digits than its factorization.

194564799025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858 (or 1929 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 194564799025 in words is "one hundred ninety-four billion, five hundred sixty-four million, seven hundred ninety-nine thousand, twenty-five".