66473287 has 4 divisors (see below), whose sum is σ = 66607000. Its totient is φ = 66339576.

The previous prime is 66473273. The next prime is 66473291. The reversal of 66473287 is 78237466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78237466 = 2 ⋅39118733.

It is a cyclic number.

It is not a de Polignac number, because 66473287 - 2⁷ = 66473159 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 (66473237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66108 + ... + 67105.

It is an arithmetic number, because the mean of its divisors is an integer number (16651750).

Almost surely, 2^66473287 is an apocalyptic number.

66473287 is a deficient number, since it is larger than the sum of its proper divisors (133713).

66473287 is a wasteful number, since it uses less digits than its factorization.

66473287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133712.

The product of its digits is 338688, while the sum is 43.

The square root of 66473287 is about 8153.1151715157. The cubic root of 66473287 is about 405.0876952810.

The spelling of 66473287 in words is "sixty-six million, four hundred seventy-three thousand, two hundred eighty-seven".