66681042 has 8 divisors (see below), whose sum is σ = 133362096. Its totient is φ = 22227012.

The previous prime is 66681037. The next prime is 66681053. The reversal of 66681042 is 24018666.

It is a happy number.

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

66681042 is an admirable number.

It is a super-2 number, since 2×66681042² = 8892722724411528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66680994 and 66681012.

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, 5556748 + ... + 5556759.

It is an arithmetic number, because the mean of its divisors is an integer number (16670262).

Almost surely, 2^66681042 is an apocalyptic number.

66681042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66681042 is a wasteful number, since it uses less digits than its factorization.

66681042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11113512.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 66681042 is about 8165.8460676160. The cubic root of 66681042 is about 405.5092755040.

The spelling of 66681042 in words is "sixty-six million, six hundred eighty-one thousand, forty-two".