27782500817 has 2 divisors, whose sum is σ = 27782500818. Its totient is φ = 27782500816.

The previous prime is 27782500789. The next prime is 27782500841. The reversal of 27782500817 is 71800528772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17156808256 + 10625692561 = 130984^2 + 103081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27782500817 is a prime.

It is a super-3 number, since 3×27782500817³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (27782500847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13891250408 + 13891250409.

It is an arithmetic number, because the mean of its divisors is an integer number (13891250409).

Almost surely, 2^27782500817 is an apocalyptic number.

It is an amenable number.

27782500817 is a deficient number, since it is larger than the sum of its proper divisors (1).

27782500817 is an equidigital number, since it uses as much as digits as its factorization.

27782500817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 439040, while the sum is 47.

The spelling of 27782500817 in words is "twenty-seven billion, seven hundred eighty-two million, five hundred thousand, eight hundred seventeen".