66681116 has 12 divisors (see below), whose sum is σ = 117783288. Its totient is φ = 33028752.

The previous prime is 66681107. The next prime is 66681133. The reversal of 66681116 is 61118666.

It is a congruent number.

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, 77471 + ... + 78326.

It is an arithmetic number, because the mean of its divisors is an integer number (9815274).

Almost surely, 2^66681116 is an apocalyptic number.

It is an amenable number.

66681116 is a deficient number, since it is larger than the sum of its proper divisors (51102172).

66681116 is a wasteful number, since it uses less digits than its factorization.

66681116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155908 (or 155906 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 66681116 is about 8165.8505986823. The cubic root of 66681116 is about 405.5094255101.

The spelling of 66681116 in words is "sixty-six million, six hundred eighty-one thousand, one hundred sixteen".