641066 has 4 divisors (see below), whose sum is σ = 961602. Its totient is φ = 320532.

The previous prime is 641057. The next prime is 641077. The reversal of 641066 is 660146.

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

It can be written as a sum of positive squares in only one way, i.e., 606841 + 34225 = 779^2 + 185^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160265 + ... + 160268.

2⁶⁴¹⁰⁶⁶ is an apocalyptic number.

641066 is a deficient number, since it is larger than the sum of its proper divisors (320536).

641066 is a wasteful number, since it uses less digits than its factorization.

641066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320535.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 641066 is about 800.6659728001. The cubic root of 641066 is about 86.2252074648.

The spelling of 641066 in words is "six hundred forty-one thousand, sixty-six".