27550521661 has 8 divisors (see below), whose sum is σ = 29678340384. Its totient is φ = 25423924080.

The previous prime is 27550521637. The next prime is 27550521673. The reversal of 27550521661 is 16612505572.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27550521661 - 2⁹ = 27550521149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27550521161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258151 + ... + 348916.

It is an arithmetic number, because the mean of its divisors is an integer number (3709792548).

Almost surely, 2^27550521661 is an apocalyptic number.

It is an amenable number.

27550521661 is a deficient number, since it is larger than the sum of its proper divisors (2127818723).

27550521661 is a wasteful number, since it uses less digits than its factorization.

27550521661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610571.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 27550521661 in words is "twenty-seven billion, five hundred fifty million, five hundred twenty-one thousand, six hundred sixty-one".