645268001 has 4 divisors (see below), whose sum is σ = 737449152. Its totient is φ = 553086852.

The previous prime is 645267989. The next prime is 645268027. The reversal of 645268001 is 100862546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645268001 - 2¹⁴ = 645251617 is a prime.

It is a super-2 number, since 2×645268001² = 832741586229072002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645268061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46090565 + ... + 46090578.

It is an arithmetic number, because the mean of its divisors is an integer number (184362288).

Almost surely, 2^645268001 is an apocalyptic number.

It is an amenable number.

645268001 is a deficient number, since it is larger than the sum of its proper divisors (92181151).

645268001 is an equidigital number, since it uses as much as digits as its factorization.

645268001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92181150.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 645268001 is about 25402.1259149702. The cubic root of 645268001 is about 864.1319104617.

It can be divided in two parts, 64526 and 8001, that added together give a palindrome (72527).

The spelling of 645268001 in words is "six hundred forty-five million, two hundred sixty-eight thousand, one".