66443065 has 8 divisors (see below), whose sum is σ = 85864968. Its totient is φ = 49065600.

The previous prime is 66443063. The next prime is 66443081. The reversal of 66443065 is 56034466.

It can be written as a sum of positive squares in 4 ways, for example, as 8743849 + 57699216 = 2957^2 + 7596^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66443065 - 2¹ = 66443063 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 66443065.

It is not an unprimeable number, because it can be changed into a prime (66443063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511036 + ... + 511165.

It is an arithmetic number, because the mean of its divisors is an integer number (10733121).

Almost surely, 2^66443065 is an apocalyptic number.

66443065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66443065 is a deficient number, since it is larger than the sum of its proper divisors (19421903).

66443065 is a wasteful number, since it uses less digits than its factorization.

66443065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022219.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 66443065 is about 8151.2615588018. The cubic root of 66443065 is about 405.0262950971.

The spelling of 66443065 in words is "sixty-six million, four hundred forty-three thousand, sixty-five".