66440141 has 4 divisors (see below), whose sum is σ = 66513984. Its totient is φ = 66366300.

The previous prime is 66440137. The next prime is 66440173. The reversal of 66440141 is 14104466.

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 66440141 - 2² = 66440137 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 66440141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440741) 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, 35555 + ... + 37376.

It is an arithmetic number, because the mean of its divisors is an integer number (16628496).

Almost surely, 2^66440141 is an apocalyptic number.

It is an amenable number.

66440141 is a deficient number, since it is larger than the sum of its proper divisors (73843).

66440141 is an equidigital number, since it uses as much as digits as its factorization.

66440141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73842.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 66440141 is about 8151.0821980888. The cubic root of 66440141 is about 405.0203535978.

The spelling of 66440141 in words is "sixty-six million, four hundred forty thousand, one hundred forty-one".