66724071 has 4 divisors (see below), whose sum is σ = 88965432. Its totient is φ = 44482712.

The previous prime is 66724039. The next prime is 66724079. The reversal of 66724071 is 17042766.

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 66724071 - 2⁵ = 66724039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724079) 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, 11120676 + ... + 11120681.

It is an arithmetic number, because the mean of its divisors is an integer number (22241358).

Almost surely, 2^66724071 is an apocalyptic number.

66724071 is a deficient number, since it is larger than the sum of its proper divisors (22241361).

66724071 is a wasteful number, since it uses less digits than its factorization.

66724071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22241360.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 66724071 is about 8168.4803360233. The cubic root of 66724071 is about 405.5964812337.

The spelling of 66724071 in words is "sixty-six million, seven hundred twenty-four thousand, seventy-one".