66180399 has 8 divisors (see below), whose sum is σ = 88553472. Its totient is φ = 43963800.

The previous prime is 66180391. The next prime is 66180403. The reversal of 66180399 is 99308166.

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

It is not a de Polignac number, because 66180399 - 2³ = 66180391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66180399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66180391) 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, 38127 + ... + 39824.

It is an arithmetic number, because the mean of its divisors is an integer number (11069184).

Almost surely, 2^66180399 is an apocalyptic number.

66180399 is a deficient number, since it is larger than the sum of its proper divisors (22373073).

66180399 is a wasteful number, since it uses less digits than its factorization.

66180399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78237.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 66180399 is about 8135.1336190624. The cubic root of 66180399 is about 404.4918669291.

The spelling of 66180399 in words is "sixty-six million, one hundred eighty thousand, three hundred ninety-nine".