27857045345 has 4 divisors (see below), whose sum is σ = 33428454420. Its totient is φ = 22285636272.

The previous prime is 27857045297. The next prime is 27857045347. The reversal of 27857045345 is 54354075872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15128016016 + 12729029329 = 122996^2 + 112823^2 .

It is a cyclic number.

It is not a de Polignac number, because 27857045345 - 2¹⁶ = 27856979809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27857045293 and 27857045302.

It is not an unprimeable number, because it can be changed into a prime (27857045347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785704530 + ... + 2785704539.

It is an arithmetic number, because the mean of its divisors is an integer number (8357113605).

Almost surely, 2^27857045345 is an apocalyptic number.

It is an amenable number.

27857045345 is a deficient number, since it is larger than the sum of its proper divisors (5571409075).

27857045345 is an equidigital number, since it uses as much as digits as its factorization.

27857045345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5571409074.

The product of its (nonzero) digits is 4704000, while the sum is 50.

The spelling of 27857045345 in words is "twenty-seven billion, eight hundred fifty-seven million, forty-five thousand, three hundred forty-five".