66467421 has 6 divisors (see below), whose sum is σ = 96008510. Its totient is φ = 44311608.

The previous prime is 66467419. The next prime is 66467461. The reversal of 66467421 is 12476466.

66467421 is a `hidden beast` number, since 6 + 646 + 7 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 27154521 = 6270^2 + 5211^2 .

It is not a de Polignac number, because 66467421 - 2¹ = 66467419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66467411) 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, 3692626 + ... + 3692643.

Almost surely, 2^66467421 is an apocalyptic number.

It is an amenable number.

66467421 is a deficient number, since it is larger than the sum of its proper divisors (29541089).

66467421 is a wasteful number, since it uses less digits than its factorization.

66467421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7385275 (or 7385272 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 66467421 is about 8152.7554237816. The cubic root of 66467421 is about 405.0757791443.

The spelling of 66467421 in words is "sixty-six million, four hundred sixty-seven thousand, four hundred twenty-one".