276845397921 has 27 divisors (see below), whose sum is σ = 403353386163. Its totient is φ = 182977749360.

The previous prime is 276845397911. The next prime is 276845397929. The reversal of 276845397921 is 129793548672.

The square root of 276845397921 is 526161.

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

276845397921 is a `hidden beast` number, since 2 + 7 + 6 + 8 + 4 + 539 + 7 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 125819893521 + 151025504400 = 354711^2 + 388620^2 .

It is not a de Polignac number, because 276845397921 - 2¹¹ = 276845395873 is a prime.

It is a super-3 number, since 3×276845397921³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (276845397929) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 200466651 + ... + 200468031.

Almost surely, 2^276845397921 is an apocalyptic number.

276845397921 is the 526161-st square number.

276845397921 is the 263081-st centered octagonal number.

It is an amenable number.

276845397921 is a deficient number, since it is larger than the sum of its proper divisors (126507988242).

276845397921 is an frugal number, since it uses more digits than its factorization.

276845397921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022 (or 1511 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 276845397921 in words is "two hundred seventy-six billion, eight hundred forty-five million, three hundred ninety-seven thousand, nine hundred twenty-one".