645442464003 has 16 divisors (see below), whose sum is σ = 884533959936. Its totient is φ = 418340993760.

The previous prime is 645442463989. The next prime is 645442464031. The reversal of 645442464003 is 300464244546.

It is a happy number.

It is not a de Polignac number, because 645442464003 - 2⁴ = 645442463987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645442464053) 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, 2108751 + ... + 2395352.

It is an arithmetic number, because the mean of its divisors is an integer number (55283372496).

Almost surely, 2^645442464003 is an apocalyptic number.

645442464003 is a deficient number, since it is larger than the sum of its proper divisors (239091495933).

645442464003 is a wasteful number, since it uses less digits than its factorization.

645442464003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505434.

The product of its (nonzero) digits is 1105920, while the sum is 42.

The spelling of 645442464003 in words is "six hundred forty-five billion, four hundred forty-two million, four hundred sixty-four thousand, three".