27745521161 has 16 divisors (see below), whose sum is σ = 30105509760. Its totient is φ = 25491164160.

The previous prime is 27745521157. The next prime is 27745521163. The reversal of 27745521161 is 16112554772.

It is a cyclic number.

It is not a de Polignac number, because 27745521161 - 2² = 27745521157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27745521163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20966 + ... + 236496.

It is an arithmetic number, because the mean of its divisors is an integer number (1881594360).

Almost surely, 2^27745521161 is an apocalyptic number.

It is an amenable number.

27745521161 is a deficient number, since it is larger than the sum of its proper divisors (2359988599).

27745521161 is a wasteful number, since it uses less digits than its factorization.

27745521161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215776.

The product of its digits is 117600, while the sum is 41.

The spelling of 27745521161 in words is "twenty-seven billion, seven hundred forty-five million, five hundred twenty-one thousand, one hundred sixty-one".