645442053 has 8 divisors (see below), whose sum is σ = 860712768. Its totient is φ = 430233024.

The previous prime is 645442051. The next prime is 645442079. The reversal of 645442053 is 350244546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645442053 - 2¹ = 645442051 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645442051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21901 + ... + 42077.

It is an arithmetic number, because the mean of its divisors is an integer number (107589096).

Almost surely, 2^645442053 is an apocalyptic number.

It is an amenable number.

645442053 is a deficient number, since it is larger than the sum of its proper divisors (215270715).

645442053 is a wasteful number, since it uses less digits than its factorization.

645442053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30843.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 645442053 is about 25405.5516177075. The cubic root of 645442053 is about 864.2095993010.

Adding to 645442053 its reverse (350244546), we get a palindrome (995686599).

The spelling of 645442053 in words is "six hundred forty-five million, four hundred forty-two thousand, fifty-three".