27561561538 has 16 divisors (see below), whose sum is σ = 49735149120. Its totient is φ = 11190408336.

The previous prime is 27561561451. The next prime is 27561561637. The reversal of 27561561538 is 83516516572.

It is a junction number, because it is equal to n+sod(n) for n = 27561561491 and 27561561500.

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, 51807181 + ... + 51807712.

It is an arithmetic number, because the mean of its divisors is an integer number (3108446820).

Almost surely, 2^27561561538 is an apocalyptic number.

27561561538 is a deficient number, since it is larger than the sum of its proper divisors (22173587582).

27561561538 is a wasteful number, since it uses less digits than its factorization.

27561561538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103614921.

The product of its digits is 1512000, while the sum is 49.

The spelling of 27561561538 in words is "twenty-seven billion, five hundred sixty-one million, five hundred sixty-one thousand, five hundred thirty-eight".