27956388869 has 2 divisors, whose sum is σ = 27956388870. Its totient is φ = 27956388868.

The previous prime is 27956388851. The next prime is 27956388883. The reversal of 27956388869 is 96888365972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16902600100 + 11053788769 = 130010^2 + 105137^2 .

It is a cyclic number.

It is not a de Polignac number, because 27956388869 - 2¹² = 27956384773 is a prime.

It is a super-2 number, since 2×27956388869² (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 (27956388839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13978194434 + 13978194435.

It is an arithmetic number, because the mean of its divisors is an integer number (13978194435).

Almost surely, 2^27956388869 is an apocalyptic number.

It is an amenable number.

27956388869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27956388869 is an equidigital number, since it uses as much as digits as its factorization.

27956388869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 313528320, while the sum is 71.

The spelling of 27956388869 in words is "twenty-seven billion, nine hundred fifty-six million, three hundred eighty-eight thousand, eight hundred sixty-nine".