5661557420 has 24 divisors (see below), whose sum is σ = 11896736544. Its totient is φ = 2263200896.

The previous prime is 5661557417. The next prime is 5661557441. The reversal of 5661557420 is 247551665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55937 + ... + 120216.

It is an arithmetic number, because the mean of its divisors is an integer number (495697356).

Almost surely, 2^5661557420 is an apocalyptic number.

It is an amenable number.

5661557420 is an abundant number, since it is smaller than the sum of its proper divisors (6235179124).

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

5661557420 is a wasteful number, since it uses less digits than its factorization.

5661557420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177769 (or 177767 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 5661557420 is about 75243.3214312074. The cubic root of 5661557420 is about 1782.2911014534.

The spelling of 5661557420 in words is "five billion, six hundred sixty-one million, five hundred fifty-seven thousand, four hundred twenty".