645032233 has 2 divisors, whose sum is σ = 645032234. Its totient is φ = 645032232.

The previous prime is 645032189. The next prime is 645032237. The reversal of 645032233 is 332230546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330076224 + 314956009 = 18168^2 + 17747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645032233 is a prime.

It is not a weakly prime, because it can be changed into another prime (645032237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322516116 + 322516117.

It is an arithmetic number, because the mean of its divisors is an integer number (322516117).

Almost surely, 2^645032233 is an apocalyptic number.

It is an amenable number.

645032233 is a deficient number, since it is larger than the sum of its proper divisors (1).

645032233 is an equidigital number, since it uses as much as digits as its factorization.

645032233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 28.

The square root of 645032233 is about 25397.4847770404. The cubic root of 645032233 is about 864.0266521449.

Adding to 645032233 its reverse (332230546), we get a palindrome (977262779).

It can be divided in two parts, 6450 and 32233, that added together give a palindrome (38683).

The spelling of 645032233 in words is "six hundred forty-five million, thirty-two thousand, two hundred thirty-three".