66275645 has 8 divisors (see below), whose sum is σ = 79976160. Its totient is φ = 52723600.

The previous prime is 66275633. The next prime is 66275669. The reversal of 66275645 is 54657266.

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

It is not a de Polignac number, because 66275645 - 2¹⁴ = 66259261 is a prime.

It is a super-3 number, since 3×66275645³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 36131 + ... + 37920.

It is an arithmetic number, because the mean of its divisors is an integer number (9997020).

Almost surely, 2^66275645 is an apocalyptic number.

It is an amenable number.

66275645 is a deficient number, since it is larger than the sum of its proper divisors (13700515).

66275645 is a wasteful number, since it uses less digits than its factorization.

66275645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74235.

The product of its digits is 302400, while the sum is 41.

The square root of 66275645 is about 8140.9855054533. The cubic root of 66275645 is about 404.6858204539.

The spelling of 66275645 in words is "sixty-six million, two hundred seventy-five thousand, six hundred forty-five".