66624073 has 4 divisors (see below), whose sum is σ = 67148800. Its totient is φ = 66099348.

The previous prime is 66624043. The next prime is 66624113. The reversal of 66624073 is 37042666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66624073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66624043) 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, 262173 + ... + 262426.

It is an arithmetic number, because the mean of its divisors is an integer number (16787200).

Almost surely, 2^66624073 is an apocalyptic number.

It is an amenable number.

66624073 is a deficient number, since it is larger than the sum of its proper divisors (524727).

66624073 is a wasteful number, since it uses less digits than its factorization.

66624073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524726.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 66624073 is about 8162.3570737870. The cubic root of 66624073 is about 405.3937602128.

The spelling of 66624073 in words is "sixty-six million, six hundred twenty-four thousand, seventy-three".