27205061556 has 12 divisors (see below), whose sum is σ = 63478476992. Its totient is φ = 9068353848.

The previous prime is 27205061473. The next prime is 27205061581. The reversal of 27205061556 is 65516050272.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×27205061556² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133544220 + ... + 1133544243.

Almost surely, 2^27205061556 is an apocalyptic number.

It is an amenable number.

27205061556 is an abundant number, since it is smaller than the sum of its proper divisors (36273415436).

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

27205061556 is a wasteful number, since it uses less digits than its factorization.

27205061556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267088470 (or 2267088468 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 27205061556 in words is "twenty-seven billion, two hundred five million, sixty-one thousand, five hundred fifty-six".