669636825 has 96 divisors (see below), whose sum is σ = 1346163840. Its totient is φ = 289228800.

The previous prime is 669636787. The next prime is 669636899. The reversal of 669636825 is 528636966.

It is not a de Polignac number, because 669636825 - 2¹³ = 669628633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 309949 + ... + 312101.

It is an arithmetic number, because the mean of its divisors is an integer number (14022540).

Almost surely, 2^669636825 is an apocalyptic number.

669636825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669636825 is an abundant number, since it is smaller than the sum of its proper divisors (676527015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669636825 is a wasteful number, since it uses less digits than its factorization.

669636825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219 (or 2214 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The square root of 669636825 is about 25877.3419230028. The cubic root of 669636825 is about 874.8758789926.

The spelling of 669636825 in words is "six hundred sixty-nine million, six hundred thirty-six thousand, eight hundred twenty-five".