66441373 has 4 divisors (see below), whose sum is σ = 66731740. Its totient is φ = 66151008.

The previous prime is 66441367. The next prime is 66441377. The reversal of 66441373 is 37314466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31843449 + 34597924 = 5643^2 + 5882^2 .

It is a cyclic number.

It is not a de Polignac number, because 66441373 - 2⁹ = 66440861 is a prime.

It is a super-2 number, since 2×66441373² = 8828912092250258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66441377) 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, 144840 + ... + 145297.

It is an arithmetic number, because the mean of its divisors is an integer number (16682935).

Almost surely, 2^66441373 is an apocalyptic number.

It is an amenable number.

66441373 is a deficient number, since it is larger than the sum of its proper divisors (290367).

66441373 is a wasteful number, since it uses less digits than its factorization.

66441373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290366.

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

The square root of 66441373 is about 8151.1577705256. The cubic root of 66441373 is about 405.0228570141.

The spelling of 66441373 in words is "sixty-six million, four hundred forty-one thousand, three hundred seventy-three".