645650441226 has 48 divisors (see below), whose sum is σ = 1614582747648. Its totient is φ = 182645100000.

The previous prime is 645650441209. The next prime is 645650441237. The reversal of 645650441226 is 622144056546.

645650441226 is a `hidden beast` number, since 64 + 56 + 504 + 4 + 12 + 26 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25354650 + ... + 25380101.

It is an arithmetic number, because the mean of its divisors is an integer number (33637140576).

Almost surely, 2^645650441226 is an apocalyptic number.

645650441226 is an abundant number, since it is smaller than the sum of its proper divisors (968932306422).

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

645650441226 is a wasteful number, since it uses less digits than its factorization.

645650441226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50734867 (or 50734864 counting only the distinct ones).

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

The spelling of 645650441226 in words is "six hundred forty-five billion, six hundred fifty million, four hundred forty-one thousand, two hundred twenty-six".