6665531625 has 48 divisors (see below), whose sum is σ = 12068668560. Its totient is φ = 3539289600.

The previous prime is 6665531603. The next prime is 6665531647. The reversal of 6665531625 is 5261355666.

6665531625 is digitally balanced in base 3, 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 (6665531603) and next prime (6665531647).

It can be written as a sum of positive squares in 8 ways, for example, as 805935321 + 5859596304 = 28389^2 + 76548^2 .

It is not a de Polignac number, because 6665531625 - 2⁷ = 6665531497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244689 + ... + 270561.

It is an arithmetic number, because the mean of its divisors is an integer number (251430595).

Almost surely, 2^6665531625 is an apocalyptic number.

It is an amenable number.

6665531625 is a deficient number, since it is larger than the sum of its proper divisors (5403136935).

6665531625 is a wasteful number, since it uses less digits than its factorization.

6665531625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26123 (or 26110 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 6665531625 is about 81642.7071145978. The cubic root of 6665531625 is about 1881.9652401894.

The spelling of 6665531625 in words is "six billion, six hundred sixty-five million, five hundred thirty-one thousand, six hundred twenty-five".