27427665769 has 27 divisors (see below), whose sum is σ = 32536729911. Its totient is φ = 23053329600.

The previous prime is 27427665763. The next prime is 27427665823. The reversal of 27427665769 is 96756672472.

The square root of 27427665769 is 165613.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 27154755369 + 272910400 = 164787^2 + 16520^2 .

It is not a de Polignac number, because 27427665769 - 2⁷ = 27427665641 is a prime.

It is a super-2 number, since 2×27427665769² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27427665763) 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 in 26 ways as a sum of consecutive naturals, for example, 68397969 + ... + 68398369.

Almost surely, 2^27427665769 is an apocalyptic number.

27427665769 is the 165613-rd square number.

27427665769 is the 82807-th centered octagonal number.

It is an amenable number.

27427665769 is a deficient number, since it is larger than the sum of its proper divisors (5109064142).

27427665769 is an frugal number, since it uses more digits than its factorization.

27427665769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 467 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 61.

The spelling of 27427665769 in words is "twenty-seven billion, four hundred twenty-seven million, six hundred sixty-five thousand, seven hundred sixty-nine".