27561561442 has 32 divisors (see below), whose sum is σ = 42840014400. Its totient is φ = 13288701888.

The previous prime is 27561561421. The next prime is 27561561451. The reversal of 27561561442 is 24416516572.

It is a super-2 number, since 2×27561561442² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4568484 + ... + 4574512.

It is an arithmetic number, because the mean of its divisors is an integer number (1338750450).

Almost surely, 2^27561561442 is an apocalyptic number.

27561561442 is a deficient number, since it is larger than the sum of its proper divisors (15278452958).

27561561442 is a wasteful number, since it uses less digits than its factorization.

27561561442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610.

The product of its digits is 403200, while the sum is 43.

The spelling of 27561561442 in words is "twenty-seven billion, five hundred sixty-one million, five hundred sixty-one thousand, four hundred forty-two".