825664989 has 8 divisors (see below), whose sum is σ = 1101889152. Its totient is φ = 549942080.

The previous prime is 825664979. The next prime is 825664991. The reversal of 825664989 is 989466528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 825664989 - 2¹² = 825660893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825664909) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 121452 + ... + 128069.

It is an arithmetic number, because the mean of its divisors is an integer number (137736144).

Almost surely, 2^825664989 is an apocalyptic number.

It is an amenable number.

825664989 is a deficient number, since it is larger than the sum of its proper divisors (276224163).

825664989 is a wasteful number, since it uses less digits than its factorization.

825664989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250627.

The product of its digits is 7464960, while the sum is 57.

The square root of 825664989 is about 28734.3868735701. The cubic root of 825664989 is about 938.1406542244.

The spelling of 825664989 in words is "eight hundred twenty-five million, six hundred sixty-four thousand, nine hundred eighty-nine".