66724055 has 4 divisors (see below), whose sum is σ = 80068872. Its totient is φ = 53379240.

The previous prime is 66724039. The next prime is 66724079. The reversal of 66724055 is 55042766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55042766 = 2 ⋅27521383.

It is not a de Polignac number, because 66724055 - 2⁴ = 66724039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6672401 + ... + 6672410.

It is an arithmetic number, because the mean of its divisors is an integer number (20017218).

Almost surely, 2^66724055 is an apocalyptic number.

66724055 is a deficient number, since it is larger than the sum of its proper divisors (13344817).

66724055 is a wasteful number, since it uses less digits than its factorization.

66724055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344816.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 66724055 is about 8168.4793566489. The cubic root of 66724055 is about 405.5964488139.

The spelling of 66724055 in words is "sixty-six million, seven hundred twenty-four thousand, fifty-five".