66233257 has 4 divisors (see below), whose sum is σ = 66639760. Its totient is φ = 65826756.

The previous prime is 66233239. The next prime is 66233311. The reversal of 66233257 is 75233266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75233266 = 2 ⋅37616633.

It is a cyclic number.

It is not a de Polignac number, because 66233257 - 2¹⁹ = 65708969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66233357) 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, 203007 + ... + 203332.

It is an arithmetic number, because the mean of its divisors is an integer number (16659940).

Almost surely, 2^66233257 is an apocalyptic number.

It is an amenable number.

66233257 is a deficient number, since it is larger than the sum of its proper divisors (406503).

66233257 is a wasteful number, since it uses less digits than its factorization.

66233257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406502.

The product of its digits is 45360, while the sum is 34.

The square root of 66233257 is about 8138.3817187448. The cubic root of 66233257 is about 404.5995269097.

Subtracting 66233257 from its reverse (75233266), we obtain a palindrome (9000009).

The spelling of 66233257 in words is "sixty-six million, two hundred thirty-three thousand, two hundred fifty-seven".