5661610666020 has 144 divisors (see below), whose sum is σ = 17224089861888. Its totient is φ = 1505321809920.

The previous prime is 5661610666009. The next prime is 5661610666057. The reversal of 5661610666020 is 206660161665.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 547698292 + ... + 547708628.

It is an arithmetic number, because the mean of its divisors is an integer number (119611735152).

Almost surely, 2^{5661610666020} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661610666020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8612044930944).

5661610666020 is an abundant number, since it is smaller than the sum of its proper divisors (11562479195868).

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

5661610666020 is a wasteful number, since it uses less digits than its factorization.

5661610666020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19010 (or 19005 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 5661610666020 in words is "five trillion, six hundred sixty-one billion, six hundred ten million, six hundred sixty-six thousand, twenty".