65133257 has 4 divisors (see below), whose sum is σ = 74438016. Its totient is φ = 55828500.

The previous prime is 65133247. The next prime is 65133281. The reversal of 65133257 is 75233156.

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.

It is not a de Polignac number, because 65133257 - 2¹⁰ = 65132233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65133247) 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, 4652369 + ... + 4652382.

It is an arithmetic number, because the mean of its divisors is an integer number (18609504).

Almost surely, 2^65133257 is an apocalyptic number.

It is an amenable number.

65133257 is a deficient number, since it is larger than the sum of its proper divisors (9304759).

65133257 is an equidigital number, since it uses as much as digits as its factorization.

65133257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9304758.

The product of its digits is 18900, while the sum is 32.

The square root of 65133257 is about 8070.5177652986. The cubic root of 65133257 is about 402.3471523341.

It can be divided in two parts, 6513 and 3257, that multiplied together give a triangular number (21212841 = T₆₅₁₃).

The spelling of 65133257 in words is "sixty-five million, one hundred thirty-three thousand, two hundred fifty-seven".