66603671 has 4 divisors (see below), whose sum is σ = 70521552. Its totient is φ = 62685792.

The previous prime is 66603661. The next prime is 66603673. The reversal of 66603671 is 17630666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66603671 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 (66603673) 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, 1958915 + ... + 1958948.

It is an arithmetic number, because the mean of its divisors is an integer number (17630388).

Almost surely, 2^66603671 is an apocalyptic number.

66603671 is a deficient number, since it is larger than the sum of its proper divisors (3917881).

66603671 is a wasteful number, since it uses less digits than its factorization.

66603671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917880.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66603671 is about 8161.1072165485. The cubic root of 66603671 is about 405.3523753324.

The spelling of 66603671 in words is "sixty-six million, six hundred three thousand, six hundred seventy-one".