4020454081449 has 27 divisors (see below), whose sum is σ = 6288524851557. Its totient is φ = 2474077466016.

The previous prime is 4020454081439. The next prime is 4020454081451. The reversal of 4020454081449 is 9441804540204.

The square root of 4020454081449 is 2005107.

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

4020454081449 is a `hidden beast` number, since 4 + 0 + 20 + 4 + 540 + 81 + 4 + 4 + 9 = 666.

4020454081449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1092248641449 + 2928205440000 = 1045107^2 + 1711200^2 .

It is not a de Polignac number, because 4020454081449 - 2¹¹ = 4020454079401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4020454081439) 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, 78173467 + ... + 78224879.

Almost surely, 2^{4020454081449} is an apocalyptic number.

4020454081449 is the 2005107-th square number.

4020454081449 is the 1002554-th centered octagonal number.

It is an amenable number.

4020454081449 is a deficient number, since it is larger than the sum of its proper divisors (2268070770108).

4020454081449 is an frugal number, since it uses more digits than its factorization.

4020454081449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102858 (or 51429 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 4020454081449 in words is "four trillion, twenty billion, four hundred fifty-four million, eighty-one thousand, four hundred forty-nine".