645061433 has 2 divisors, whose sum is σ = 645061434. Its totient is φ = 645061432.

The previous prime is 645061421. The next prime is 645061451. The reversal of 645061433 is 334160546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645007609 + 53824 = 25397^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 645061433 - 2⁸ = 645061177 is a prime.

It is a super-2 number, since 2×645061433² = 832208504688026978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645061433.

It is not a weakly prime, because it can be changed into another prime (645061453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322530716 + 322530717.

It is an arithmetic number, because the mean of its divisors is an integer number (322530717).

Almost surely, 2^645061433 is an apocalyptic number.

It is an amenable number.

645061433 is a deficient number, since it is larger than the sum of its proper divisors (1).

645061433 is an equidigital number, since it uses as much as digits as its factorization.

645061433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 645061433 is about 25398.0596306096. The cubic root of 645061433 is about 864.0396898384.

The spelling of 645061433 in words is "six hundred forty-five million, sixty-one thousand, four hundred thirty-three".