66671269 has 4 divisors (see below), whose sum is σ = 76195744. Its totient is φ = 57146796.

The previous prime is 66671251. The next prime is 66671279. The reversal of 66671269 is 96217666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66671269 - 2²¹ = 64574117 is a prime.

It is a super-2 number, since 2×66671269² = 8890116220140722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66671249) 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, 4762227 + ... + 4762240.

It is an arithmetic number, because the mean of its divisors is an integer number (19048936).

Almost surely, 2^66671269 is an apocalyptic number.

It is an amenable number.

66671269 is a deficient number, since it is larger than the sum of its proper divisors (9524475).

66671269 is an equidigital number, since it uses as much as digits as its factorization.

66671269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524474.

The product of its digits is 163296, while the sum is 43.

The square root of 66671269 is about 8165.2476386206. The cubic root of 66671269 is about 405.4894635972.

The spelling of 66671269 in words is "sixty-six million, six hundred seventy-one thousand, two hundred sixty-nine".