27661533305 has 16 divisors (see below), whose sum is σ = 38362066560. Its totient is φ = 18754783872.

The previous prime is 27661533301. The next prime is 27661533353. The reversal of 27661533305 is 50333516672.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27661533305 - 2² = 27661533301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27661533301) 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, 4436939 + ... + 4443168.

It is an arithmetic number, because the mean of its divisors is an integer number (2397629160).

Almost surely, 2^27661533305 is an apocalyptic number.

It is an amenable number.

27661533305 is a deficient number, since it is larger than the sum of its proper divisors (10700533255).

27661533305 is an equidigital number, since it uses as much as digits as its factorization.

27661533305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880208.

The product of its (nonzero) digits is 340200, while the sum is 41.

The spelling of 27661533305 in words is "twenty-seven billion, six hundred sixty-one million, five hundred thirty-three thousand, three hundred five".