66681043 has 12 divisors (see below), whose sum is σ = 78933904. Its totient is φ = 55954800.

The previous prime is 66681037. The next prime is 66681053. The reversal of 66681043 is 34018666.

It is not a de Polignac number, because 66681043 - 2⁵ = 66681011 is a prime.

It is a super-2 number, since 2×66681043² = 8892722991135698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66681053) 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 11 ways as a sum of consecutive naturals, for example, 19623 + ... + 22768.

Almost surely, 2^66681043 is an apocalyptic number.

66681043 is a deficient number, since it is larger than the sum of its proper divisors (12252861).

66681043 is a wasteful number, since it uses less digits than its factorization.

66681043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42426 (or 42415 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 66681043 is about 8165.8461288467. The cubic root of 66681043 is about 405.5092775311.

The spelling of 66681043 in words is "sixty-six million, six hundred eighty-one thousand, forty-three".