66423650 has 12 divisors (see below), whose sum is σ = 123548082. Its totient is φ = 26569440.

The previous prime is 66423647. The next prime is 66423653. The reversal of 66423650 is 5632466.

It is an interprime number because it is at equal distance from previous prime (66423647) and next prime (66423653).

It can be written as a sum of positive squares in 3 ways, for example, as 64432729 + 1990921 = 8027^2 + 1411^2 .

It is not an unprimeable number, because it can be changed into a prime (66423653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 664187 + ... + 664286.

Almost surely, 2^66423650 is an apocalyptic number.

66423650 is a deficient number, since it is larger than the sum of its proper divisors (57124432).

66423650 is a wasteful number, since it uses less digits than its factorization.

66423650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328485 (or 1328480 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66423650 is about 8150.0705518419. The cubic root of 66423650 is about 404.9868410092.

The spelling of 66423650 in words is "sixty-six million, four hundred twenty-three thousand, six hundred fifty".