27945011257 has 4 divisors (see below), whose sum is σ = 27945490320. Its totient is φ = 27944532196.

The previous prime is 27945011243. The next prime is 27945011317. The reversal of 27945011257 is 75211054972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27945011257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27945011357) 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, 137563 + ... + 273520.

It is an arithmetic number, because the mean of its divisors is an integer number (6986372580).

Almost surely, 2^27945011257 is an apocalyptic number.

It is an amenable number.

27945011257 is a deficient number, since it is larger than the sum of its proper divisors (479063).

27945011257 is an equidigital number, since it uses as much as digits as its factorization.

27945011257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479062.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 27945011257 in words is "twenty-seven billion, nine hundred forty-five million, eleven thousand, two hundred fifty-seven".