666426125 has 32 divisors (see below), whose sum is σ = 849638400. Its totient is φ = 521769600.

The previous prime is 666426107. The next prime is 666426143. The reversal of 666426125 is 521624666.

It is an interprime number because it is at equal distance from previous prime (666426107) and next prime (666426143).

It is not a de Polignac number, because 666426125 - 2¹⁰ = 666425101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1815692 + ... + 1816058.

It is an arithmetic number, because the mean of its divisors is an integer number (26551200).

Almost surely, 2^666426125 is an apocalyptic number.

It is an amenable number.

666426125 is a deficient number, since it is larger than the sum of its proper divisors (183212275).

666426125 is a wasteful number, since it uses less digits than its factorization.

666426125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 644 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 666426125 is about 25815.2304851225. The cubic root of 666426125 is about 873.4753858469.

The spelling of 666426125 in words is "six hundred sixty-six million, four hundred twenty-six thousand, one hundred twenty-five".