66501312 has 28 divisors (see below), whose sum is σ = 175951896. Its totient is φ = 22167040.

The previous prime is 66501301. The next prime is 66501341. The reversal of 66501312 is 21310566.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172989 + ... + 173372.

Almost surely, 2^66501312 is an apocalyptic number.

It is an amenable number.

66501312 is an abundant number, since it is smaller than the sum of its proper divisors (109450584).

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

66501312 is a wasteful number, since it uses less digits than its factorization.

66501312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346376 (or 346366 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66501312 is about 8154.8336586346. The cubic root of 66501312 is about 405.1446153269.

Adding to 66501312 its reverse (21310566), we get a palindrome (87811878).

The spelling of 66501312 in words is "sixty-six million, five hundred one thousand, three hundred twelve".