3666640565620 has 12 divisors (see below), whose sum is σ = 7699945187844. Its totient is φ = 1466656226240.

The previous prime is 3666640565587. The next prime is 3666640565663. The reversal of 3666640565620 is 265650466663.

It can be written as a sum of positive squares in 2 ways, for example, as 1804933136484 + 1861707429136 = 1343478^2 + 1364444^2 .

It is a super-3 number, since 3×3666640565620³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91666014121 + ... + 91666014160.

It is an arithmetic number, because the mean of its divisors is an integer number (641662098987).

Almost surely, 2^{3666640565620} is an apocalyptic number.

It is an amenable number.

3666640565620 is an abundant number, since it is smaller than the sum of its proper divisors (4033304622224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3666640565620 is a wasteful number, since it uses less digits than its factorization.

3666640565620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183332028290 (or 183332028288 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 55.

The spelling of 3666640565620 in words is "three trillion, six hundred sixty-six billion, six hundred forty million, five hundred sixty-five thousand, six hundred twenty".