274878955521 has 9 divisors (see below), whose sum is σ = 397049652129. Its totient is φ = 183251588436.

The previous prime is 274878955499. The next prime is 274878955537. The reversal of 274878955521 is 125559878472.

The square root of 274878955521 is 524289.

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

274878955521 is a `hidden beast` number, since 2 + 7 + 4 + 8 + 78 + 9 + 5 + 552 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 274878955521 - 2¹¹ = 274878953473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (274878255521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1485486 + ... + 1660248.

It is a Proth number, since it is equal to 262145 ⋅ 2²⁰ + 1 and 262145 < 2²⁰.

Almost surely, 2^274878955521 is an apocalyptic number.

274878955521 is the 524289-th square number.

274878955521 is the 262145-th centered octagonal number.

It is an amenable number.

274878955521 is a deficient number, since it is larger than the sum of its proper divisors (122170696608).

274878955521 is an frugal number, since it uses more digits than its factorization.

274878955521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349532 (or 174766 counting only the distinct ones).

The product of its digits is 56448000, while the sum is 63.

The spelling of 274878955521 in words is "two hundred seventy-four billion, eight hundred seventy-eight million, nine hundred fifty-five thousand, five hundred twenty-one".