66678712 has 16 divisors (see below), whose sum is σ = 127683360. Its totient is φ = 32629824.

The previous prime is 66678707. The next prime is 66678713. The reversal of 66678712 is 21787666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66678713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88293 + ... + 89044.

It is an arithmetic number, because the mean of its divisors is an integer number (7980210).

Almost surely, 2^66678712 is an apocalyptic number.

It is an amenable number.

66678712 is a deficient number, since it is larger than the sum of its proper divisors (61004648).

66678712 is a wasteful number, since it uses less digits than its factorization.

66678712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177390 (or 177386 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 66678712 is about 8165.7033989730. The cubic root of 66678712 is about 405.5045522844.

The spelling of 66678712 in words is "sixty-six million, six hundred seventy-eight thousand, seven hundred twelve".