66371650 has 24 divisors (see below), whose sum is σ = 123874884. Its totient is φ = 26457600.

The previous prime is 66371647. The next prime is 66371653. The reversal of 66371650 is 5617366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66371647) and next prime (66371653).

It can be written as a sum of positive squares in 6 ways, for example, as 22534009 + 43837641 = 4747^2 + 6621^2 .

It is not an unprimeable number, because it can be changed into a prime (66371653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13530 + ... + 17770.

Almost surely, 2^66371650 is an apocalyptic number.

66371650 is a deficient number, since it is larger than the sum of its proper divisors (57503234).

66371650 is a wasteful number, since it uses less digits than its factorization.

66371650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566 (or 4561 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66371650 is about 8146.8797708080. The cubic root of 66371650 is about 404.8811316041.

The spelling of 66371650 in words is "sixty-six million, three hundred seventy-one thousand, six hundred fifty".