66545501 has 8 divisors (see below), whose sum is σ = 74366208. Its totient is φ = 59020000.

The previous prime is 66545491. The next prime is 66545503. The reversal of 66545501 is 10554566.

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

It is a cyclic number.

It is not a de Polignac number, because 66545501 - 2¹⁴ = 66529117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73325 + ... + 74226.

It is an arithmetic number, because the mean of its divisors is an integer number (9295776).

Almost surely, 2^66545501 is an apocalyptic number.

It is an amenable number.

66545501 is a deficient number, since it is larger than the sum of its proper divisors (7820707).

66545501 is a wasteful number, since it uses less digits than its factorization.

66545501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147603.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 66545501 is about 8157.5425834010. The cubic root of 66545501 is about 405.2343327120.

The spelling of 66545501 in words is "sixty-six million, five hundred forty-five thousand, five hundred one".