66538426 has 8 divisors (see below), whose sum is σ = 101690964. Its totient is φ = 32641440.

The previous prime is 66538421. The next prime is 66538481. The reversal of 66538426 is 62483566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 59521225 + 7017201 = 7715^2 + 2649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66538421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313755 + ... + 313966.

Almost surely, 2^66538426 is an apocalyptic number.

66538426 is a deficient number, since it is larger than the sum of its proper divisors (35152538).

66538426 is a wasteful number, since it uses less digits than its factorization.

66538426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627776.

The product of its digits is 207360, while the sum is 40.

The square root of 66538426 is about 8157.1089241226. The cubic root of 66538426 is about 405.2199709371.

The spelling of 66538426 in words is "sixty-six million, five hundred thirty-eight thousand, four hundred twenty-six".