66471409 has 9 divisors (see below), whose sum is σ = 68946969. Its totient is φ = 64082580.

The previous prime is 66471389. The next prime is 66471467. The reversal of 66471409 is 90417466.

The square root of 66471409 is 8153.

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

It is not a de Polignac number, because 66471409 - 2⁷ = 66471281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66471109) 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, 252612 + ... + 252874.

Almost surely, 2^66471409 is an apocalyptic number.

66471409 is the 8153-rd square number.

66471409 is the 4077-th centered octagonal number.

It is an amenable number.

66471409 is a deficient number, since it is larger than the sum of its proper divisors (2475560).

66471409 is an frugal number, since it uses more digits than its factorization.

66471409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The cubic root of 66471409 is about 405.0838804060.

The spelling of 66471409 in words is "sixty-six million, four hundred seventy-one thousand, four hundred nine".