66724141 has 4 divisors (see below), whose sum is σ = 72789984. Its totient is φ = 60658300.

The previous prime is 66724129. The next prime is 66724159. The reversal of 66724141 is 14142766.

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 not a de Polignac number, because 66724141 - 2⁵ = 66724109 is a prime.

It is a super-2 number, since 2×66724141² = 8904221984375762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724171) 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, 3032905 + ... + 3032926.

It is an arithmetic number, because the mean of its divisors is an integer number (18197496).

Almost surely, 2^66724141 is an apocalyptic number.

It is an amenable number.

66724141 is a deficient number, since it is larger than the sum of its proper divisors (6065843).

66724141 is a wasteful number, since it uses less digits than its factorization.

66724141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065842.

The product of its digits is 8064, while the sum is 31.

The square root of 66724141 is about 8168.4846207849. The cubic root of 66724141 is about 405.5966230703.

The spelling of 66724141 in words is "sixty-six million, seven hundred twenty-four thousand, one hundred forty-one".