817166725 has 24 divisors (see below), whose sum is σ = 1068527840. Its totient is φ = 618217920.

The previous prime is 817166717. The next prime is 817166729. The reversal of 817166725 is 527661718.

817166725 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 817166725 - 2³ = 817166717 is a prime.

It is a super-2 number, since 2×817166725² = 1335522912894451250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817166729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347002 + ... + 349348.

Almost surely, 2^817166725 is an apocalyptic number.

It is an amenable number.

817166725 is a deficient number, since it is larger than the sum of its proper divisors (251361115).

817166725 is a wasteful number, since it uses less digits than its factorization.

817166725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 3104 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 817166725 is about 28586.1281918346. The cubic root of 817166725 is about 934.9109030794.

The spelling of 817166725 in words is "eight hundred seventeen million, one hundred sixty-six thousand, seven hundred twenty-five".