27355519817 has 2 divisors, whose sum is σ = 27355519818. Its totient is φ = 27355519816.

The previous prime is 27355519771. The next prime is 27355519853. The reversal of 27355519817 is 71891555372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16374785296 + 10980734521 = 127964^2 + 104789^2 .

It is a cyclic number.

It is not a de Polignac number, because 27355519817 - 2²⁶ = 27288410953 is a prime.

It is not a weakly prime, because it can be changed into another prime (27355519517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13677759908 + 13677759909.

It is an arithmetic number, because the mean of its divisors is an integer number (13677759909).

Almost surely, 2^27355519817 is an apocalyptic number.

It is an amenable number.

27355519817 is a deficient number, since it is larger than the sum of its proper divisors (1).

27355519817 is an equidigital number, since it uses as much as digits as its factorization.

27355519817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646000, while the sum is 53.

The spelling of 27355519817 in words is "twenty-seven billion, three hundred fifty-five million, five hundred nineteen thousand, eight hundred seventeen".