645624432066 has 32 divisors (see below), whose sum is σ = 1292592888576. Its totient is φ = 214984250000.

The previous prime is 645624432059. The next prime is 645624432067. The reversal of 645624432066 is 660234426546.

It is not an unprimeable number, because it can be changed into a prime (645624432067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28291801 + ... + 28314611.

It is an arithmetic number, because the mean of its divisors is an integer number (40393527768).

Almost surely, 2^645624432066 is an apocalyptic number.

645624432066 is an abundant number, since it is smaller than the sum of its proper divisors (646968456510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645624432066 is a wasteful number, since it uses less digits than its factorization.

645624432066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27518.

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 645624432066 in words is "six hundred forty-five billion, six hundred twenty-four million, four hundred thirty-two thousand, sixty-six".