645540646124 has 24 divisors (see below), whose sum is σ = 1232560098000. Its totient is φ = 293388442880.

The previous prime is 645540646109. The next prime is 645540646133. The reversal of 645540646124 is 421646045546.

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, 643049 + ... + 1305600.

It is an arithmetic number, because the mean of its divisors is an integer number (51356670750).

Almost surely, 2^645540646124 is an apocalyptic number.

It is an amenable number.

645540646124 is a deficient number, since it is larger than the sum of its proper divisors (587019451876).

645540646124 is a wasteful number, since it uses less digits than its factorization.

645540646124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956193 (or 1956191 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 645540646124 in words is "six hundred forty-five billion, five hundred forty million, six hundred forty-six thousand, one hundred twenty-four".