645016001 has 8 divisors (see below), whose sum is σ = 739903680. Its totient is φ = 550813968.

The previous prime is 645015967. The next prime is 645016007. The reversal of 645016001 is 100610546.

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

It is a cyclic number.

It is not a de Polignac number, because 645016001 - 2⁶ = 645015937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645016007) 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, 169391 + ... + 173156.

It is an arithmetic number, because the mean of its divisors is an integer number (92487960).

Almost surely, 2^645016001 is an apocalyptic number.

It is an amenable number.

645016001 is a deficient number, since it is larger than the sum of its proper divisors (94887679).

645016001 is a wasteful number, since it uses less digits than its factorization.

645016001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342823.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 645016001 is about 25397.1652158267. The cubic root of 645016001 is about 864.0194044460.

Adding to 645016001 its reverse (100610546), we get a palindrome (745626547).

The spelling of 645016001 in words is "six hundred forty-five million, sixteen thousand, one".