66324737 has 4 divisors (see below), whose sum is σ = 66358020. Its totient is φ = 66291456.

The previous prime is 66324733. The next prime is 66324743. The reversal of 66324737 is 73742366.

It is a happy number.

It is a Cunningham number, because it is equal to 8144²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16777216 + 49547521 = 4096^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 66324737 - 2² = 66324733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66324737.

It is not an unprimeable number, because it can be changed into a prime (66324733) 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, 13448 + ... + 17705.

It is an arithmetic number, because the mean of its divisors is an integer number (16589505).

Almost surely, 2^66324737 is an apocalyptic number.

It is an amenable number.

66324737 is a deficient number, since it is larger than the sum of its proper divisors (33283).

66324737 is a wasteful number, since it uses less digits than its factorization.

66324737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33282.

The product of its digits is 127008, while the sum is 38.

The square root of 66324737 is about 8144.0000613949. Note that the first 4 decimals coincide. The cubic root of 66324737 is about 404.7857160391.

The spelling of 66324737 in words is "sixty-six million, three hundred twenty-four thousand, seven hundred thirty-seven".