666324650560625 has 40 divisors (see below), whose sum is σ = 969542238620736. Its totient is φ = 448287419736000.

The previous prime is 666324650560607. The next prime is 666324650560633. The reversal of 666324650560625 is 526065056423666.

It is not a de Polignac number, because 666324650560625 - 2³² = 666320355593329 is a prime.

It is a super-4 number, since 4×666324650560625⁴ (a number of 60 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1436586779 + ... + 1437050528.

Almost surely, 2^{666324650560625} is an apocalyptic number.

It is an amenable number.

666324650560625 is a deficient number, since it is larger than the sum of its proper divisors (303217588060111).

666324650560625 is an equidigital number, since it uses as much as digits as its factorization.

666324650560625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873637387 (or 2873637372 counting only the distinct ones).

The product of its (nonzero) digits is 279936000, while the sum is 62.

The spelling of 666324650560625 in words is "six hundred sixty-six trillion, three hundred twenty-four billion, six hundred fifty million, five hundred sixty thousand, six hundred twenty-five".