66218045 has 8 divisors (see below), whose sum is σ = 80191320. Its totient is φ = 52488000.

The previous prime is 66218039. The next prime is 66218051. The reversal of 66218045 is 54081266.

It is an interprime number because it is at equal distance from previous prime (66218039) and next prime (66218051).

It can be written as a sum of positive squares in 4 ways, for example, as 12313081 + 53904964 = 3509^2 + 7342^2 .

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

It is not a de Polignac number, because 66218045 - 2⁴ = 66218029 is a prime.

It is a Curzon number.

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, 60206 + ... + 61295.

It is an arithmetic number, because the mean of its divisors is an integer number (10023915).

Almost surely, 2^66218045 is an apocalyptic number.

It is an amenable number.

66218045 is a deficient number, since it is larger than the sum of its proper divisors (13973275).

66218045 is a wasteful number, since it uses less digits than its factorization.

66218045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121615.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 66218045 is about 8137.4470812411. The cubic root of 66218045 is about 404.5685493237.

The spelling of 66218045 in words is "sixty-six million, two hundred eighteen thousand, forty-five".