645535763700000 has 144 divisors (see below), whose sum is σ = 2118028663114560. Its totient is φ = 172142870240000.

The previous prime is 645535763699999. The next prime is 645535763700011. The reversal of 645535763700000 is 7367535546.

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 23 ways as a sum of consecutive naturals, for example, 1075592940 + ... + 1076192939.

It is an arithmetic number, because the mean of its divisors is an integer number (14708532382740).

Almost surely, 2^{645535763700000} is an apocalyptic number.

645535763700000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645535763700000 is an abundant number, since it is smaller than the sum of its proper divisors (1472492899414560).

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

645535763700000 is an equidigital number, since it uses as much as digits as its factorization.

645535763700000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151785917 (or 2151785889 counting only the distinct ones).

The product of its (nonzero) digits is 7938000, while the sum is 51.

The spelling of 645535763700000 in words is "six hundred forty-five trillion, five hundred thirty-five billion, seven hundred sixty-three million, seven hundred thousand".