645507005 has 16 divisors (see below), whose sum is σ = 910030464. Its totient is φ = 433346880.

The previous prime is 645507001. The next prime is 645507041. The reversal of 645507005 is 500705546.

It is a happy number.

It is not a de Polignac number, because 645507005 - 2² = 645507001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645507001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450689 + ... + 452118.

It is an arithmetic number, because the mean of its divisors is an integer number (56876904).

Almost surely, 2^645507005 is an apocalyptic number.

645507005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645507005 is a deficient number, since it is larger than the sum of its proper divisors (264523459).

645507005 is a wasteful number, since it uses less digits than its factorization.

645507005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902836.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 645507005 is about 25406.8298888311. The cubic root of 645507005 is about 864.2385873198.

The spelling of 645507005 in words is "six hundred forty-five million, five hundred seven thousand, five".