666696925 has 6 divisors (see below), whose sum is σ = 826704218. Its totient is φ = 533357520.

The previous prime is 666696923. The next prime is 666696931. The reversal of 666696925 is 529696666.

It can be written as a sum of positive squares in 3 ways, for example, as 83667609 + 583029316 = 9147^2 + 24146^2 .

It is not a de Polignac number, because 666696925 - 2¹ = 666696923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666696923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13333914 + ... + 13333963.

Almost surely, 2^666696925 is an apocalyptic number.

It is an amenable number.

666696925 is a deficient number, since it is larger than the sum of its proper divisors (160007293).

666696925 is a wasteful number, since it uses less digits than its factorization.

666696925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26667887 (or 26667882 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 55.

The square root of 666696925 is about 25820.4749181730. The cubic root of 666696925 is about 873.5936810808.

The spelling of 666696925 in words is "six hundred sixty-six million, six hundred ninety-six thousand, nine hundred twenty-five".