27969286657 has 4 divisors (see below), whose sum is σ = 30120770260. Its totient is φ = 25817803056.

The previous prime is 27969286633. The next prime is 27969286687. The reversal of 27969286657 is 75668296972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14550149376 + 13419137281 = 120624^2 + 115841^2 .

It is a cyclic number.

It is not a de Polignac number, because 27969286657 - 2²⁷ = 27835068929 is a prime.

It is a super-2 number, since 2×27969286657² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27969286592 and 27969286601.

It is not an unprimeable number, because it can be changed into a prime (27969286687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075741782 + ... + 1075741807.

It is an arithmetic number, because the mean of its divisors is an integer number (7530192565).

Almost surely, 2^27969286657 is an apocalyptic number.

It is an amenable number.

27969286657 is a deficient number, since it is larger than the sum of its proper divisors (2151483603).

27969286657 is a wasteful number, since it uses less digits than its factorization.

27969286657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151483602.

The product of its digits is 137168640, while the sum is 67.

The spelling of 27969286657 in words is "twenty-seven billion, nine hundred sixty-nine million, two hundred eighty-six thousand, six hundred fifty-seven".