66954671 has 4 divisors (see below), whose sum is σ = 76519632. Its totient is φ = 57389712.

The previous prime is 66954661. The next prime is 66954683. The reversal of 66954671 is 17645966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66954671 - 2⁶ = 66954607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66954661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4782470 + ... + 4782483.

It is an arithmetic number, because the mean of its divisors is an integer number (19129908).

Almost surely, 2^66954671 is an apocalyptic number.

66954671 is a deficient number, since it is larger than the sum of its proper divisors (9564961).

66954671 is an equidigital number, since it uses as much as digits as its factorization.

66954671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9564960.

The product of its digits is 272160, while the sum is 44.

The square root of 66954671 is about 8182.5833940144. The cubic root of 66954671 is about 406.0631943985.

The spelling of 66954671 in words is "sixty-six million, nine hundred fifty-four thousand, six hundred seventy-one".