66545061 has 8 divisors (see below), whose sum is σ = 96792864. Its totient is φ = 40330320.

The previous prime is 66545057. The next prime is 66545071. The reversal of 66545061 is 16054566.

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

It is not a de Polignac number, because 66545061 - 2² = 66545057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2016517 = 66545061 / (6 + 6 + 5 + 4 + 5 + 0 + 6 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008226 + ... + 1008291.

It is an arithmetic number, because the mean of its divisors is an integer number (12099108).

Almost surely, 2^66545061 is an apocalyptic number.

It is an amenable number.

66545061 is a deficient number, since it is larger than the sum of its proper divisors (30247803).

66545061 is a wasteful number, since it uses less digits than its factorization.

66545061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016531.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 66545061 is about 8157.5156144503. The cubic root of 66545061 is about 405.2334395713.

The spelling of 66545061 in words is "sixty-six million, five hundred forty-five thousand, sixty-one".