666733331 has 8 divisors (see below), whose sum is σ = 729086400. Its totient is φ = 604670440.

The previous prime is 666733297. The next prime is 666733357. The reversal of 666733331 is 133337666.

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

It is a de Polignac number, because none of the positive numbers 2^k-666733331 is a prime.

It is a super-2 number, since 2×666733331² = 889066669332711122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666733391) 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, 67721 + ... + 76938.

It is an arithmetic number, because the mean of its divisors is an integer number (91135800).

Almost surely, 2^666733331 is an apocalyptic number.

666733331 is a deficient number, since it is larger than the sum of its proper divisors (62353069).

666733331 is a wasteful number, since it uses less digits than its factorization.

666733331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145089.

The product of its digits is 122472, while the sum is 38.

The square root of 666733331 is about 25821.1798917091. The cubic root of 666733331 is about 873.6095820954.

The spelling of 666733331 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, three hundred thirty-one".