6420431296449 has 9 divisors (see below), whose sum is σ = 9273967297153. Its totient is φ = 4280282463252.

The previous prime is 6420431296427. The next prime is 6420431296457. The reversal of 6420431296449 is 9446921340246.

The square root of 6420431296449 is 2533857.

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

6420431296449 is a `hidden beast` number, since 64 + 2 + 0 + 43 + 12 + 96 + 449 = 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 6420431296449 - 2⁹ = 6420431295937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6420431296395 and 6420431296404.

It is not an unprimeable number, because it can be changed into a prime (6420431294449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7179262 + ... + 8023880.

Almost surely, 2^{6420431296449} is an apocalyptic number.

6420431296449 is the 2533857-th square number.

6420431296449 is the 1266929-th centered octagonal number.

It is an amenable number.

6420431296449 is a deficient number, since it is larger than the sum of its proper divisors (2853536000704).

6420431296449 is an frugal number, since it uses more digits than its factorization.

6420431296449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689244 (or 844622 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 6420431296449 in words is "six trillion, four hundred twenty billion, four hundred thirty-one million, two hundred ninety-six thousand, four hundred forty-nine".