66623271 has 16 divisors (see below), whose sum is σ = 104361600. Its totient is φ = 37271520.

The previous prime is 66623269. The next prime is 66623303. The reversal of 66623271 is 17232666.

It is not a de Polignac number, because 66623271 - 2¹ = 66623269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66623201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77221 + ... + 78078.

It is an arithmetic number, because the mean of its divisors is an integer number (6522600).

Almost surely, 2^66623271 is an apocalyptic number.

66623271 is a deficient number, since it is larger than the sum of its proper divisors (37738329).

66623271 is a wasteful number, since it uses less digits than its factorization.

66623271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155326.

The product of its digits is 18144, while the sum is 33.

The square root of 66623271 is about 8162.3079456732. The cubic root of 66623271 is about 405.3921335380.

The spelling of 66623271 in words is "sixty-six million, six hundred twenty-three thousand, two hundred seventy-one".