5661556542 has 12 divisors (see below), whose sum is σ = 12266705880. Its totient is φ = 1887185508.

The previous prime is 5661556531. The next prime is 5661556547. The reversal of 5661556542 is 2456551665.

5661556542 is a `hidden beast` number, since 56 + 6 + 1 + 5 + 56 + 542 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661556547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157265442 + ... + 157265477.

It is an arithmetic number, because the mean of its divisors is an integer number (1022225490).

Almost surely, 2^5661556542 is an apocalyptic number.

5661556542 is an abundant number, since it is smaller than the sum of its proper divisors (6605149338).

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

5661556542 is a wasteful number, since it uses less digits than its factorization.

5661556542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314530927 (or 314530924 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The square root of 5661556542 is about 75243.3155968024. The cubic root of 5661556542 is about 1782.2910093202.

The spelling of 5661556542 in words is "five billion, six hundred sixty-one million, five hundred fifty-six thousand, five hundred forty-two".