666051025 has 6 divisors (see below), whose sum is σ = 825903302. Its totient is φ = 532840800.

The previous prime is 666051019. The next prime is 666051031. The reversal of 666051025 is 520150666.

666051025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666051019) and next prime (666051031).

It can be written as a sum of positive squares in 3 ways, for example, as 61481281 + 604569744 = 7841^2 + 24588^2 .

It is not a de Polignac number, because 666051025 - 2³ = 666051017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13320996 + ... + 13321045.

Almost surely, 2^666051025 is an apocalyptic number.

It is an amenable number.

666051025 is a deficient number, since it is larger than the sum of its proper divisors (159852277).

666051025 is a wasteful number, since it uses less digits than its factorization.

666051025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26642051 (or 26642046 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 666051025 is about 25807.9643714881. The cubic root of 666051025 is about 873.3114756522.

The spelling of 666051025 in words is "six hundred sixty-six million, fifty-one thousand, twenty-five".