645261333 has 16 divisors (see below), whose sum is σ = 911678976. Its totient is φ = 404549120.

The previous prime is 645261313. The next prime is 645261341. The reversal of 645261333 is 333162546.

645261333 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645261333 - 2¹⁰ = 645260309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645261294 and 645261303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645261313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71260 + ... + 79802.

It is an arithmetic number, because the mean of its divisors is an integer number (56979936).

Almost surely, 2^645261333 is an apocalyptic number.

It is an amenable number.

645261333 is a deficient number, since it is larger than the sum of its proper divisors (266417643).

645261333 is a wasteful number, since it uses less digits than its factorization.

645261333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10044.

The product of its digits is 38880, while the sum is 33.

The square root of 645261333 is about 25401.9946657738. The cubic root of 645261333 is about 864.1289338941.

The spelling of 645261333 in words is "six hundred forty-five million, two hundred sixty-one thousand, three hundred thirty-three".