66618354 has 16 divisors (see below), whose sum is σ = 145349280. Its totient is φ = 20187360.

The previous prime is 66618353. The next prime is 66618361. The reversal of 66618354 is 45381666.

It is not an unprimeable number, because it can be changed into a prime (66618353) 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, 504619 + ... + 504750.

It is an arithmetic number, because the mean of its divisors is an integer number (9084330).

Almost surely, 2^66618354 is an apocalyptic number.

66618354 is an abundant number, since it is smaller than the sum of its proper divisors (78730926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66618354 is a wasteful number, since it uses less digits than its factorization.

66618354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009385.

The product of its digits is 103680, while the sum is 39.

The square root of 66618354 is about 8162.0067385417. The cubic root of 66618354 is about 405.3821602352.

The spelling of 66618354 in words is "sixty-six million, six hundred eighteen thousand, three hundred fifty-four".