66426530 has 48 divisors (see below), whose sum is σ = 129601080. Its totient is φ = 24482304.

The previous prime is 66426491. The next prime is 66426551. The reversal of 66426530 is 3562466.

It can be written as a sum of positive squares in 4 ways, for example, as 40589641 + 25836889 = 6371^2 + 5083^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153194 + ... + 153626.

Almost surely, 2^66426530 is an apocalyptic number.

66426530 is a deficient number, since it is larger than the sum of its proper divisors (63174550).

66426530 is a wasteful number, since it uses less digits than its factorization.

66426530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 492 counting only the distinct ones).

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

The square root of 66426530 is about 8150.2472355138. The cubic root of 66426530 is about 404.9926940713.

Adding to 66426530 its reverse (3562466), we get a palindrome (69988996).

The spelling of 66426530 in words is "sixty-six million, four hundred twenty-six thousand, five hundred thirty".