27705306557 has 16 divisors (see below), whose sum is σ = 28253422080. Its totient is φ = 27162844800.

The previous prime is 27705306547. The next prime is 27705306569. The reversal of 27705306557 is 75560350772.

It is a cyclic number.

It is not a de Polignac number, because 27705306557 - 2²⁶ = 27638197693 is a prime.

It is a super-2 number, since 2×27705306557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27705306547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6901883 + ... + 6905895.

It is an arithmetic number, because the mean of its divisors is an integer number (1765838880).

Almost surely, 2^27705306557 is an apocalyptic number.

It is an amenable number.

27705306557 is a deficient number, since it is larger than the sum of its proper divisors (548115523).

27705306557 is a wasteful number, since it uses less digits than its factorization.

27705306557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684.

The product of its (nonzero) digits is 1543500, while the sum is 47.

The spelling of 27705306557 in words is "twenty-seven billion, seven hundred five million, three hundred six thousand, five hundred fifty-seven".