66043645 has 8 divisors (see below), whose sum is σ = 79980120. Its totient is φ = 52349760.

The previous prime is 66043619. The next prime is 66043669. The reversal of 66043645 is 54634066.

It can be written as a sum of positive squares in 4 ways, for example, as 21874329 + 44169316 = 4677^2 + 6646^2 .

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

It is not a de Polignac number, because 66043645 - 2⁵ = 66043613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66043645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60046 + ... + 61135.

It is an arithmetic number, because the mean of its divisors is an integer number (9997515).

Almost surely, 2^66043645 is an apocalyptic number.

It is an amenable number.

66043645 is a deficient number, since it is larger than the sum of its proper divisors (13936475).

66043645 is a wasteful number, since it uses less digits than its factorization.

66043645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121295.

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

The square root of 66043645 is about 8126.7241247627. The cubic root of 66043645 is about 404.2130632014.

The spelling of 66043645 in words is "sixty-six million, forty-three thousand, six hundred forty-five".