645244153 has 16 divisors (see below), whose sum is σ = 679170816. Its totient is φ = 612455040.

The previous prime is 645244151. The next prime is 645244157. The reversal of 645244153 is 351442546.

It is a cyclic number.

It is not a de Polignac number, because 645244153 - 2¹ = 645244151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645244151) 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 in 15 ways as a sum of consecutive naturals, for example, 207750 + ... + 210832.

It is an arithmetic number, because the mean of its divisors is an integer number (42448176).

Almost surely, 2^645244153 is an apocalyptic number.

It is an amenable number.

645244153 is a deficient number, since it is larger than the sum of its proper divisors (33926663).

645244153 is a wasteful number, since it uses less digits than its factorization.

645244153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264.

The product of its digits is 57600, while the sum is 34.

The square root of 645244153 is about 25401.6565011024. The cubic root of 645244153 is about 864.1212647188.

Adding to 645244153 its reverse (351442546), we get a palindrome (996686699).

It can be divided in two parts, 6452 and 44153, that added together give a palindrome (50605).

The spelling of 645244153 in words is "six hundred forty-five million, two hundred forty-four thousand, one hundred fifty-three".