3661220302556 has 24 divisors (see below), whose sum is σ = 6426905580816. Its totient is φ = 1824969968640.

The previous prime is 3661220302529. The next prime is 3661220302577. The reversal of 3661220302556 is 6552030221663.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694076 + ... + 2793596.

It is an arithmetic number, because the mean of its divisors is an integer number (267787732534).

Almost surely, 2^{3661220302556} is an apocalyptic number.

It is an amenable number.

3661220302556 is a deficient number, since it is larger than the sum of its proper divisors (2765685278260).

3661220302556 is a wasteful number, since it uses less digits than its factorization.

3661220302556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100869 (or 2100867 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 3661220302556 in words is "three trillion, six hundred sixty-one billion, two hundred twenty million, three hundred two thousand, five hundred fifty-six".