66661343 has 8 divisors (see below), whose sum is σ = 78811680. Its totient is φ = 55167840.

The previous prime is 66661339. The next prime is 66661363. The reversal of 66661343 is 34316666.

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

It is not a de Polignac number, because 66661343 - 2² = 66661339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66661363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163988 + ... + 164393.

It is an arithmetic number, because the mean of its divisors is an integer number (9851460).

Almost surely, 2^66661343 is an apocalyptic number.

66661343 is a deficient number, since it is larger than the sum of its proper divisors (12150337).

66661343 is a wasteful number, since it uses less digits than its factorization.

66661343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328417.

The product of its digits is 46656, while the sum is 35.

The square root of 66661343 is about 8164.6397960963. The cubic root of 66661343 is about 405.4693395456.

The spelling of 66661343 in words is "sixty-six million, six hundred sixty-one thousand, three hundred forty-three".