6515453421 has 24 divisors (see below), whose sum is σ = 9460376640. Its totient is φ = 4321003200.

The previous prime is 6515453407. The next prime is 6515453423. The reversal of 6515453421 is 1243545156.

6515453421 is a `hidden beast` number, since 6 + 51 + 54 + 534 + 21 = 666.

It is not a de Polignac number, because 6515453421 - 2¹³ = 6515445229 is a prime.

It is a super-5 number, since 5×6515453421⁵ (a number of 50 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6515453423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1590586 + ... + 1594676.

It is an arithmetic number, because the mean of its divisors is an integer number (394182360).

Almost surely, 2^6515453421 is an apocalyptic number.

It is an amenable number.

6515453421 is a deficient number, since it is larger than the sum of its proper divisors (2944923219).

6515453421 is a wasteful number, since it uses less digits than its factorization.

6515453421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977 (or 4974 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 6515453421 is about 80718.3586366819. The cubic root of 6515453421 is about 1867.7333839495.

Adding to 6515453421 its reverse (1243545156), we get a palindrome (7758998577).

The spelling of 6515453421 in words is "six billion, five hundred fifteen million, four hundred fifty-three thousand, four hundred twenty-one".