66180505 has 8 divisors (see below), whose sum is σ = 81978624. Its totient is φ = 51236400.

The previous prime is 66180503. The next prime is 66180509. The reversal of 66180505 is 50508166.

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

It is not a de Polignac number, because 66180505 - 2¹ = 66180503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66180503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213331 + ... + 213640.

It is an arithmetic number, because the mean of its divisors is an integer number (10247328).

Almost surely, 2^66180505 is an apocalyptic number.

It is an amenable number.

66180505 is a deficient number, since it is larger than the sum of its proper divisors (15798119).

66180505 is a wasteful number, since it uses less digits than its factorization.

66180505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427007.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 66180505 is about 8135.1401340112. The cubic root of 66180505 is about 404.4920828849.

The spelling of 66180505 in words is "sixty-six million, one hundred eighty thousand, five hundred five".