66240751 has 8 divisors (see below), whose sum is σ = 66830400. Its totient is φ = 65653920.

The previous prime is 66240739. The next prime is 66240761. The reversal of 66240751 is 15704266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66240751 - 2¹¹ = 66238703 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 (66240701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91770 + ... + 92488.

It is an arithmetic number, because the mean of its divisors is an integer number (8353800).

Almost surely, 2^66240751 is an apocalyptic number.

66240751 is a deficient number, since it is larger than the sum of its proper divisors (589649).

66240751 is a wasteful number, since it uses less digits than its factorization.

66240751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66240751 is about 8138.8421166650. The cubic root of 66240751 is about 404.6147858831.

The spelling of 66240751 in words is "sixty-six million, two hundred forty thousand, seven hundred fifty-one".