66681045 has 12 divisors (see below), whose sum is σ = 115580556. Its totient is φ = 35563200.

The previous prime is 66681037. The next prime is 66681053. The reversal of 66681045 is 54018666.

It is an interprime number because it is at equal distance from previous prime (66681037) and next prime (66681053).

It can be written as a sum of positive squares in 2 ways, for example, as 38229489 + 28451556 = 6183^2 + 5334^2 .

It is not a de Polignac number, because 66681045 - 2³ = 66681037 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 740856 + ... + 740945.

It is an arithmetic number, because the mean of its divisors is an integer number (9631713).

Almost surely, 2^66681045 is an apocalyptic number.

It is an amenable number.

66681045 is a deficient number, since it is larger than the sum of its proper divisors (48899511).

66681045 is a wasteful number, since it uses less digits than its factorization.

66681045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481812 (or 1481809 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66681045 is about 8165.8462513079. The cubic root of 66681045 is about 405.5092815854.

The spelling of 66681045 in words is "sixty-six million, six hundred eighty-one thousand, forty-five".