645837833 has 2 divisors, whose sum is σ = 645837834. Its totient is φ = 645837832.

The previous prime is 645837811. The next prime is 645837851. The reversal of 645837833 is 338738546.

645837833 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558471424 + 87366409 = 23632^2 + 9347^2 .

It is a cyclic number.

It is not a de Polignac number, because 645837833 - 2¹⁶ = 645772297 is a prime.

It is not a weakly prime, because it can be changed into another prime (645857833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322918916 + 322918917.

It is an arithmetic number, because the mean of its divisors is an integer number (322918917).

Almost surely, 2^645837833 is an apocalyptic number.

It is an amenable number.

645837833 is a deficient number, since it is larger than the sum of its proper divisors (1).

645837833 is an equidigital number, since it uses as much as digits as its factorization.

645837833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 47.

The square root of 645837833 is about 25413.3396664035. The cubic root of 645837833 is about 864.3862053888.

The spelling of 645837833 in words is "six hundred forty-five million, eight hundred thirty-seven thousand, eight hundred thirty-three".