645442650216 has 144 divisors (see below), whose sum is σ = 2189894861700. Its totient is φ = 170226620928.

The previous prime is 645442650199. The next prime is 645442650217. The reversal of 645442650216 is 612056244546.

645442650216 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 426 + 5 + 0 + 216 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 505307722500 + 140134927716 = 710850^2 + 374346^2 .

It is not an unprimeable number, because it can be changed into a prime (645442650217) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6990621 + ... + 7082348.

Almost surely, 2^645442650216 is an apocalyptic number.

It is an amenable number.

645442650216 is an abundant number, since it is smaller than the sum of its proper divisors (1544452211484).

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

645442650216 is a wasteful number, since it uses less digits than its factorization.

645442650216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14073008 (or 14072994 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 645442650216 in words is "six hundred forty-five billion, four hundred forty-two million, six hundred fifty thousand, two hundred sixteen".