666051425 has 24 divisors (see below), whose sum is σ = 891677304. Its totient is φ = 490613760.

The previous prime is 666051389. The next prime is 666051433. The reversal of 666051425 is 524150666.

666051425 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 543262864 + 122788561 = 23308^2 + 11081^2 .

It is not a de Polignac number, because 666051425 - 2⁶ = 666051361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138359 + ... + 143091.

It is an arithmetic number, because the mean of its divisors is an integer number (37153221).

Almost surely, 2^666051425 is an apocalyptic number.

666051425 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

666051425 is a deficient number, since it is larger than the sum of its proper divisors (225625879).

666051425 is a wasteful number, since it uses less digits than its factorization.

666051425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189 (or 5184 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 666051425 is about 25807.9721210327. The cubic root of 666051425 is about 873.3116504759.

It can be divided in two parts, 6660 and 51425, that added together give a palindrome (58085).

The spelling of 666051425 in words is "six hundred sixty-six million, fifty-one thousand, four hundred twenty-five".