66968178 has 16 divisors (see below), whose sum is σ = 134529120. Its totient is φ = 22223936.

The previous prime is 66968171. The next prime is 66968227. The reversal of 66968178 is 87186966.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66968178.

It is not an unprimeable number, because it can be changed into a prime (66968171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23223 + ... + 25946.

It is an arithmetic number, because the mean of its divisors is an integer number (8408070).

Almost surely, 2^66968178 is an apocalyptic number.

66968178 is an abundant number, since it is smaller than the sum of its proper divisors (67560942).

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

66968178 is a wasteful number, since it uses less digits than its factorization.

66968178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49401.

The product of its digits is 870912, while the sum is 51.

The square root of 66968178 is about 8183.4087029795. The cubic root of 66968178 is about 406.0904980788.

The spelling of 66968178 in words is "sixty-six million, nine hundred sixty-eight thousand, one hundred seventy-eight".