645243431244216 has 32 divisors (see below), whose sum is σ = 1843552660698240. Its totient is φ = 184355266069728.

The previous prime is 645243431244211. The next prime is 645243431244221. The reversal of 645243431244216 is 612442134342546.

It is an interprime number because it is at equal distance from previous prime (645243431244211) and next prime (645243431244221).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645243431244211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1920367354726 + ... + 1920367355061.

It is an arithmetic number, because the mean of its divisors is an integer number (57611020646820).

Almost surely, 2^{645243431244216} is an apocalyptic number.

It is an amenable number.

645243431244216 is an abundant number, since it is smaller than the sum of its proper divisors (1198309229454024).

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

645243431244216 is a wasteful number, since it uses less digits than its factorization.

645243431244216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840734709803 (or 3840734709799 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 51.

The spelling of 645243431244216 in words is "six hundred forty-five trillion, two hundred forty-three billion, four hundred thirty-one million, two hundred forty-four thousand, two hundred sixteen".