27909534869 has 2 divisors, whose sum is σ = 27909534870. Its totient is φ = 27909534868.

The previous prime is 27909534857. The next prime is 27909534973. The reversal of 27909534869 is 96843590972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20467021969 + 7442512900 = 143063^2 + 86270^2 .

It is a cyclic number.

It is not a de Polignac number, because 27909534869 - 2³² = 23614567573 is a prime.

It is a super-2 number, since 2×27909534869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27909534839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13954767434 + 13954767435.

It is an arithmetic number, because the mean of its divisors is an integer number (13954767435).

Almost surely, 2^27909534869 is an apocalyptic number.

It is an amenable number.

27909534869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27909534869 is an equidigital number, since it uses as much as digits as its factorization.

27909534869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 27909534869 in words is "twenty-seven billion, nine hundred nine million, five hundred thirty-four thousand, eight hundred sixty-nine".