66724965 has 40 divisors (see below), whose sum is σ = 121445280. Its totient is φ = 35041248.

The previous prime is 66724963. The next prime is 66724967. The reversal of 66724965 is 56942766.

It is an interprime number because it is at equal distance from previous prime (66724963) and next prime (66724967).

It is not a de Polignac number, because 66724965 - 2¹ = 66724963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 66724965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724963) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25906 + ... + 28364.

It is an arithmetic number, because the mean of its divisors is an integer number (3036132).

Almost surely, 2^66724965 is an apocalyptic number.

It is an amenable number.

66724965 is a deficient number, since it is larger than the sum of its proper divisors (54720315).

66724965 is a wasteful number, since it uses less digits than its factorization.

66724965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543 (or 2534 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 66724965 is about 8168.5350583810. The cubic root of 66724965 is about 405.5982926821.

The spelling of 66724965 in words is "sixty-six million, seven hundred twenty-four thousand, nine hundred sixty-five".