5661656020 has 12 divisors (see below), whose sum is σ = 11889477684. Its totient is φ = 2264662400.

The previous prime is 5661655997. The next prime is 5661656027. The reversal of 5661656020 is 206561665.

It can be written as a sum of positive squares in 2 ways, for example, as 3836315844 + 1825340176 = 61938^2 + 42724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661656027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141541381 + ... + 141541420.

It is an arithmetic number, because the mean of its divisors is an integer number (990789807).

Almost surely, 2^5661656020 is an apocalyptic number.

It is an amenable number.

5661656020 is an abundant number, since it is smaller than the sum of its proper divisors (6227821664).

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

5661656020 is a wasteful number, since it uses less digits than its factorization.

5661656020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283082810 (or 283082808 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 5661656020 is about 75243.9766360072. The cubic root of 5661656020 is about 1782.3014480105.

The spelling of 5661656020 in words is "five billion, six hundred sixty-one million, six hundred fifty-six thousand, twenty".