66240943 has 4 divisors (see below), whose sum is σ = 69121008. Its totient is φ = 63360880.

The previous prime is 66240929. The next prime is 66240971. The reversal of 66240943 is 34904266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34904266 = 2 ⋅17452133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66240943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66240899 and 66240908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240913) 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, 1439998 + ... + 1440043.

It is an arithmetic number, because the mean of its divisors is an integer number (17280252).

Almost surely, 2^66240943 is an apocalyptic number.

66240943 is a deficient number, since it is larger than the sum of its proper divisors (2880065).

66240943 is a wasteful number, since it uses less digits than its factorization.

66240943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880064.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 66240943 is about 8138.8539119461. The cubic root of 66240943 is about 404.6151768104.

The spelling of 66240943 in words is "sixty-six million, two hundred forty thousand, nine hundred forty-three".