3666644601520 has 80 divisors (see below), whose sum is σ = 9150066054720. Its totient is φ = 1361474445312.

The previous prime is 3666644601509. The next prime is 3666644601533. The reversal of 3666644601520 is 251064466663.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18366900 + ... + 18565459.

It is an arithmetic number, because the mean of its divisors is an integer number (114375825684).

Almost surely, 2^{3666644601520} is an apocalyptic number.

It is an amenable number.

3666644601520 is an abundant number, since it is smaller than the sum of its proper divisors (5483421453200).

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

3666644601520 is a wasteful number, since it uses less digits than its factorization.

3666644601520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36932462 (or 36932456 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 3666644601520 in words is "three trillion, six hundred sixty-six billion, six hundred forty-four million, six hundred one thousand, five hundred twenty".