66919070 has 16 divisors (see below), whose sum is σ = 123018048. Its totient is φ = 26197920.

The previous prime is 66919063. The next prime is 66919079. The reversal of 66919070 is 7091966.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919079) 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 7 ways as a sum of consecutive naturals, for example, 70721 + ... + 71660.

It is an arithmetic number, because the mean of its divisors is an integer number (7688628).

Almost surely, 2^66919070 is an apocalyptic number.

66919070 is a deficient number, since it is larger than the sum of its proper divisors (56098978).

66919070 is a wasteful number, since it uses less digits than its factorization.

66919070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142435.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 66919070 is about 8180.4076915518. The cubic root of 66919070 is about 405.9912112765.

The spelling of 66919070 in words is "sixty-six million, nine hundred nineteen thousand, seventy".