66544141 has 4 divisors (see below), whose sum is σ = 66561472. Its totient is φ = 66526812.

The previous prime is 66544139. The next prime is 66544147. The reversal of 66544141 is 14144566.

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 66544141 - 2¹ = 66544139 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 (66544147) 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, 51 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (16640368).

Almost surely, 2^66544141 is an apocalyptic number.

It is an amenable number.

66544141 is a deficient number, since it is larger than the sum of its proper divisors (17331).

66544141 is a wasteful number, since it uses less digits than its factorization.

66544141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17330.

The product of its digits is 11520, while the sum is 31.

The square root of 66544141 is about 8157.4592245380. The cubic root of 66544141 is about 405.2315720824.

The spelling of 66544141 in words is "sixty-six million, five hundred forty-four thousand, one hundred forty-one".