645440266112 has 16 divisors (see below), whose sum is σ = 1285838030400. Its totient is φ = 322720132992.

The previous prime is 645440266111. The next prime is 645440266127. The reversal of 645440266112 is 211662044546.

645440266112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 645440266112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645440266111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2521250912 + ... + 2521251167.

It is an arithmetic number, because the mean of its divisors is an integer number (80364876900).

Almost surely, 2^645440266112 is an apocalyptic number.

It is an amenable number.

645440266112 is a deficient number, since it is larger than the sum of its proper divisors (640397764288).

645440266112 is an equidigital number, since it uses as much as digits as its factorization.

645440266112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042502093 (or 5042502081 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 645440266112 in words is "six hundred forty-five billion, four hundred forty million, two hundred sixty-six thousand, one hundred twelve".