645640005302 has 16 divisors (see below), whose sum is σ = 990942714000. Its totient is φ = 315396803040.

The previous prime is 645640005299. The next prime is 645640005319. The reversal of 645640005302 is 203500046546.

It is a happy number.

It is a super-2 number, since 2×645640005302² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17740652 + ... + 17777007.

It is an arithmetic number, because the mean of its divisors is an integer number (61933919625).

Almost surely, 2^645640005302 is an apocalyptic number.

645640005302 is a deficient number, since it is larger than the sum of its proper divisors (345302708698).

645640005302 is a wasteful number, since it uses less digits than its factorization.

645640005302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35517871.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 645640005302 in words is "six hundred forty-five billion, six hundred forty million, five thousand, three hundred two".