27685953257 has 2 divisors, whose sum is σ = 27685953258. Its totient is φ = 27685953256.

The previous prime is 27685953241. The next prime is 27685953299. The reversal of 27685953257 is 75235958672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26128782736 + 1557170521 = 161644^2 + 39461^2 .

It is a cyclic number.

It is not a de Polignac number, because 27685953257 - 2⁴ = 27685953241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27685953196 and 27685953205.

It is not a weakly prime, because it can be changed into another prime (27685353257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13842976628 + 13842976629.

It is an arithmetic number, because the mean of its divisors is an integer number (13842976629).

Almost surely, 2^27685953257 is an apocalyptic number.

It is an amenable number.

27685953257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27685953257 is an equidigital number, since it uses as much as digits as its factorization.

27685953257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752000, while the sum is 59.

The spelling of 27685953257 in words is "twenty-seven billion, six hundred eighty-five million, nine hundred fifty-three thousand, two hundred fifty-seven".