645643505346546 has 32 divisors (see below), whose sum is σ = 1478985810353280. Its totient is φ = 184065919618176.

The previous prime is 645643505346533. The next prime is 645643505346571.

It is a happy number.

645643505346546 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16818869661 + ... + 16818908048.

It is an arithmetic number, because the mean of its divisors is an integer number (46218306573540).

Almost surely, 2^{645643505346546} is an apocalyptic number.

645643505346546 is an abundant number, since it is smaller than the sum of its proper divisors (833342305006734).

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

645643505346546 is a wasteful number, since it uses less digits than its factorization.

645643505346546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33637778178.

The product of its (nonzero) digits is 1866240000, while the sum is 66.

The spelling of 645643505346546 in words is "six hundred forty-five trillion, six hundred forty-three billion, five hundred five million, three hundred forty-six thousand, five hundred forty-six".