66783331 has 8 divisors (see below), whose sum is σ = 69484544. Its totient is φ = 64116360.

The previous prime is 66783323. The next prime is 66783337. The reversal of 66783331 is 13338766.

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 66783331 - 2³ = 66783323 is a prime.

It is a super-3 number, since 3×66783331³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66783337) 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, 4545 + ... + 12418.

It is an arithmetic number, because the mean of its divisors is an integer number (8685568).

Almost surely, 2^66783331 is an apocalyptic number.

66783331 is a deficient number, since it is larger than the sum of its proper divisors (2701213).

66783331 is a wasteful number, since it uses less digits than its factorization.

66783331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17121.

The product of its digits is 54432, while the sum is 37.

The square root of 66783331 is about 8172.1068886793. The cubic root of 66783331 is about 405.7165205489.

The spelling of 66783331 in words is "sixty-six million, seven hundred eighty-three thousand, three hundred thirty-one".