27566161920 has 720 divisors, whose sum is σ = 108775954560. Its totient is φ = 6617825280.

The previous prime is 27566161849. The next prime is 27566161949. The reversal of 27566161920 is 2916166572.

27566161920 is a `hidden beast` number, since 2 + 7 + 5 + 6 + 6 + 1 + 619 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 267632589 + ... + 267632691.

Almost surely, 2^27566161920 is an apocalyptic number.

27566161920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27566161920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54387977280).

27566161920 is an abundant number, since it is smaller than the sum of its proper divisors (81209792640).

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

27566161920 is a wasteful number, since it uses less digits than its factorization.

27566161920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 27566161920 in words is "twenty-seven billion, five hundred sixty-six million, one hundred sixty-one thousand, nine hundred twenty".