645752033 has 2 divisors, whose sum is σ = 645752034. Its totient is φ = 645752032.

The previous prime is 645752017. The next prime is 645752101. The reversal of 645752033 is 330257546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407111329 + 238640704 = 20177^2 + 15448^2 .

It is a cyclic number.

It is not a de Polignac number, because 645752033 - 2⁴ = 645752017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645751984 and 645752002.

It is not a weakly prime, because it can be changed into another prime (645754033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322876016 + 322876017.

It is an arithmetic number, because the mean of its divisors is an integer number (322876017).

Almost surely, 2^645752033 is an apocalyptic number.

It is an amenable number.

645752033 is a deficient number, since it is larger than the sum of its proper divisors (1).

645752033 is an equidigital number, since it uses as much as digits as its factorization.

645752033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 645752033 is about 25411.6515205132. The cubic root of 645752033 is about 864.3479255931.

The spelling of 645752033 in words is "six hundred forty-five million, seven hundred fifty-two thousand, thirty-three".