8194686725 has 18 divisors (see below), whose sum is σ = 10197197970. Its totient is φ = 6532741600.

The previous prime is 8194686707. The next prime is 8194686727. The reversal of 8194686725 is 5276864918.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2293835236 + 5900851489 = 47894^2 + 76817^2 .

It is not a de Polignac number, because 8194686725 - 2²⁰ = 8193638149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8194686727) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2416331 + ... + 2419719.

Almost surely, 2^8194686725 is an apocalyptic number.

It is an amenable number.

8194686725 is a deficient number, since it is larger than the sum of its proper divisors (2002511245).

8194686725 is an equidigital number, since it uses as much as digits as its factorization.

8194686725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021 (or 3705 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The square root of 8194686725 is about 90524.5089740894. The cubic root of 8194686725 is about 2016.0940373438.

The spelling of 8194686725 in words is "eight billion, one hundred ninety-four million, six hundred eighty-six thousand, seven hundred twenty-five".