6465575421 has 6 divisors (see below), whose sum is σ = 9339164510. Its totient is φ = 4310383608.

The previous prime is 6465575387. The next prime is 6465575423. The reversal of 6465575421 is 1245755646.

6465575421 is a `hidden beast` number, since 6 + 46 + 557 + 54 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6397760196 + 67815225 = 79986^2 + 8235^2 .

It is not a de Polignac number, because 6465575421 - 2¹⁰ = 6465574397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6465575423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359198626 + ... + 359198643.

Almost surely, 2^6465575421 is an apocalyptic number.

It is an amenable number.

6465575421 is a deficient number, since it is larger than the sum of its proper divisors (2873589089).

6465575421 is a wasteful number, since it uses less digits than its factorization.

6465575421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718397275 (or 718397272 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 45.

The square root of 6465575421 is about 80408.8018876043. The cubic root of 6465575421 is about 1862.9551264428.

The spelling of 6465575421 in words is "six billion, four hundred sixty-five million, five hundred seventy-five thousand, four hundred twenty-one".