645454616612226 has 32 divisors (see below), whose sum is σ = 1325806943264448. Its totient is φ = 209335326419520.

The previous prime is 645454616612219. The next prime is 645454616612237. The reversal of 645454616612226 is 622216616454546.

It is a super-2 number, since 2×645454616612226² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645454616612226.

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, 26915736 + ... + 44892828.

It is an arithmetic number, because the mean of its divisors is an integer number (41431466977014).

Almost surely, 2^{645454616612226} is an apocalyptic number.

645454616612226 is an abundant number, since it is smaller than the sum of its proper divisors (680352326652222).

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

645454616612226 is a wasteful number, since it uses less digits than its factorization.

645454616612226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18138866.

The product of its digits is 99532800, while the sum is 60.

The spelling of 645454616612226 in words is "six hundred forty-five trillion, four hundred fifty-four billion, six hundred sixteen million, six hundred twelve thousand, two hundred twenty-six".